Pub Date : 2026-01-02DOI: 10.1016/j.radphyschem.2026.113611
Hongji Li , Fengqin Ge , Feng Li , Ruotong Zhen , Lijun Feng , Dongxiao Sun-Waterhouse , Yongli Wang
This study investigated the effects of electron beam irradiation (EBI) at different doses (0, 1, 3, 5, 7 or 9 kGy) on the total viable count and lipid or protein oxidative stability of vacuum-packed fresh pork during chilled storage (4 °C, 15 days). Compared with the non-irradiated pork, EBI ≥3 kGy significantly (P < 0.05) decreased total viable count while causing significant (P < 0.05) increases in peroxide value, and contents of thiobarbituric acid reactive substances, carbonyl, disulfide bonds and dityrosine of the chilled fresh pork. EBI induced myofibrillar protein unfolding decreased α-helix and β-turn, increased β-sheet and random coils, increased surface hydrophobicity, and decreased endogenous tryptophan fluorescence intensity in a dose-dependent manner, compared with the non-irradiated samples. SDS-PAGE results showed that EBI ≥7 kGy caused cross-linking and aggregation of proteins, likely due to the oxidation of sulfydryl groups and formation of more disulfide bonds. Accordingly, EBI at 3–5 kGy along with vacuum-packaging can be applied to fresh pork before chilled storage to extend its shelf life.
{"title":"Effects of electron beam irradiation on lipid oxidation and myofibrillar protein oxidation in vacuum-packaged fresh pork during chilled storage","authors":"Hongji Li , Fengqin Ge , Feng Li , Ruotong Zhen , Lijun Feng , Dongxiao Sun-Waterhouse , Yongli Wang","doi":"10.1016/j.radphyschem.2026.113611","DOIUrl":"10.1016/j.radphyschem.2026.113611","url":null,"abstract":"<div><div>This study investigated the effects of electron beam irradiation (EBI) at different doses (0, 1, 3, 5, 7 or 9 kGy) on the total viable count and lipid or protein oxidative stability of vacuum-packed fresh pork during chilled storage (4 °C, 15 days). Compared with the non-irradiated pork, EBI ≥3 kGy significantly (<em>P</em> < 0.05) decreased total viable count while causing significant (<em>P</em> < 0.05) increases in peroxide value, and contents of thiobarbituric acid reactive substances, carbonyl, disulfide bonds and dityrosine of the chilled fresh pork. EBI induced myofibrillar protein unfolding decreased α-helix and β-turn, increased β-sheet and random coils, increased surface hydrophobicity, and decreased endogenous tryptophan fluorescence intensity in a dose-dependent manner, compared with the non-irradiated samples. SDS-PAGE results showed that EBI ≥7 kGy caused cross-linking and aggregation of proteins, likely due to the oxidation of sulfydryl groups and formation of more disulfide bonds. Accordingly, EBI at 3–5 kGy along with vacuum-packaging can be applied to fresh pork before chilled storage to extend its shelf life.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113611"},"PeriodicalIF":2.8,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-02DOI: 10.1016/j.radphyschem.2025.113590
Zaky A. Zaky, Ali Hennache, Ilyas Antraoui, Ali Khettabi, V.D. Zhaketov, Mahmoud A. Zaky
{"title":"Radiation Detector Using Nano Textured Interfaces in Photonic Crystal","authors":"Zaky A. Zaky, Ali Hennache, Ilyas Antraoui, Ali Khettabi, V.D. Zhaketov, Mahmoud A. Zaky","doi":"10.1016/j.radphyschem.2025.113590","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.113590","url":null,"abstract":"","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"22 1","pages":"113590"},"PeriodicalIF":2.9,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of our studies of the fine structures of X-ray diffraction patterns formed in X-ray 3-block defocused interferometers, as well as on a new method to record these structures, are presented in this paper. A new monolithic 4-block X-ray diffraction system, combined with a 3-block defocused L-L-L interferometer and a thick 4th block situated in the reflection position, has been developed and applied. It is shown that the fine structures of X-ray interference patterns from 3-block defocused interferometers can also be detected when its first two blocks are thin and the 3rd block is thick. The formation of interference patterns with specific fine structures as families of parallel stripes in a plane perpendicular to the diffraction vector is experimentally proved for X-ray 3-block defocused interferometers. It is revealed that the 4th block is responsible only for increasing the X-ray interference pattern's linear size without introducing new information into it. It is also experimentally demonstrated that the fine structures of X-ray diffraction patterns are also revealed in the bi-crystal systems with a non-diffracting zone, which has also been confirmed by the use of an additional ideal thick block. The identity of fine structures of X-ray diffraction patterns observed in 3-block defocused interferometers and bi-crystal systems of a narrow air gap has been demonstrated. For the first time, the identity of the effect of an additional thick ideal block on diffraction patterns obtained from 3-block defocused interferometers and bi-crystal diffraction systems with a narrow air gap has been experimentally demonstrated and confirmed.
{"title":"On similarity of X-ray diffraction patterns in 3-block interferometers and Bi-crystal systems","authors":"H.R. Drmeyan , S.A. Mkhitaryan , V.N. Aghabekyan , A.R. Mnatsakanyan , A.M. Minasyan , S.B. Dabagov","doi":"10.1016/j.radphyschem.2026.113593","DOIUrl":"10.1016/j.radphyschem.2026.113593","url":null,"abstract":"<div><div>The results of our studies of the fine structures of X-ray diffraction patterns formed in X-ray 3-block defocused interferometers, as well as on a new method to record these structures, are presented in this paper. A new monolithic 4-block X-ray diffraction system, combined with a 3-block defocused L-L-L interferometer and a thick 4th block situated in the reflection position, has been developed and applied. It is shown that the fine structures of X-ray interference patterns from 3-block defocused interferometers can also be detected when its first two blocks are thin and the 3rd block is thick. The formation of interference patterns with specific fine structures as families of parallel stripes in a plane perpendicular to the diffraction vector is experimentally proved for X-ray 3-block defocused interferometers. It is revealed that the 4th block is responsible only for increasing the X-ray interference pattern's linear size without introducing new information into it. It is also experimentally demonstrated that the fine structures of X-ray diffraction patterns are also revealed in the bi-crystal systems with a non-diffracting zone, which has also been confirmed by the use of an additional ideal thick block. The identity of fine structures of X-ray diffraction patterns observed in 3-block defocused interferometers and bi-crystal systems of a narrow air gap has been demonstrated. For the first time, the identity of the effect of an additional thick ideal block on diffraction patterns obtained from 3-block defocused interferometers and bi-crystal diffraction systems with a narrow air gap has been experimentally demonstrated and confirmed.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113593"},"PeriodicalIF":2.8,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.radphyschem.2026.113604
Seyed Javad Seyedi , Ehsan Ebrahimibasabi , Mohammad Mahdi Shahidi
In this study, B4C particles with a particle size ranging from 10 to 20 μm were subjected to irradiation using cobalt-60 radioisotope at varying radiation doses of 10, 50, 100, 150, and 200 kGy. To investigate the radiation-induced effects, FTIR spectroscopy within the wavenumber range of 400–4000 cm−1 and DRS in the range of 200–1200 nm were employed for the analysis of both pre-irradiated and post-irradiated samples. The FTIR spectroscopy results reveal a diminishing trend in amorphization at a dose of 100 kGy, indicating the emergence of a crystalline structure within the sample. Additionally, the DRS analysis demonstrates that the sample irradiated with a dose of 100 kGy exhibits the highest reflectance and the lowest band gap among all the tested samples. The B4C sample irradiated with 100 kGy of gamma radiation exhibits promising potential for the development of B4C-incorporating composites for specific applications.
{"title":"Characterization of optical and structural bonding properties of B4C microparticles under gamma radiation","authors":"Seyed Javad Seyedi , Ehsan Ebrahimibasabi , Mohammad Mahdi Shahidi","doi":"10.1016/j.radphyschem.2026.113604","DOIUrl":"10.1016/j.radphyschem.2026.113604","url":null,"abstract":"<div><div>In this study, B<sub>4</sub>C particles with a particle size ranging from 10 to 20 μm were subjected to irradiation using cobalt-60 radioisotope at varying radiation doses of 10, 50, 100, 150, and 200 kGy. To investigate the radiation-induced effects, FTIR spectroscopy within the wavenumber range of 400–4000 cm<sup>−1</sup> and DRS in the range of 200–1200 nm were employed for the analysis of both pre-irradiated and post-irradiated samples. The FTIR spectroscopy results reveal a diminishing trend in amorphization at a dose of 100 kGy, indicating the emergence of a crystalline structure within the sample. Additionally, the DRS analysis demonstrates that the sample irradiated with a dose of 100 kGy exhibits the highest reflectance and the lowest band gap among all the tested samples. The B<sub>4</sub>C sample irradiated with 100 kGy of gamma radiation exhibits promising potential for the development of B<sub>4</sub>C-incorporating composites for specific applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113604"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, a comprehensive analysis is presented for the Dion–Jacobson family of layered perovskites, specifically CsXNb2O7 (X = La, Lu, In, Ga) compounds, through the application of first-principles calculations. Utilizing density functional theory (DFT), structural refinement is conducted via X-ray diffraction (XRD) simulations with a Cu-Kα1 monochromatic radiation source (λ = 1.54439 nm). In ELF, due to cesium charge transfer, oxygen atoms have tightly restricted areas with ELF values closer to 1.0, showing their anionic character (O2−). The investigation encompassed an in-depth evaluation of electronic, optical, elastic, mechanical, and thermodynamic properties by Generalized Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional. The computed electronic band structures reveal that all variants exhibit indirect band gaps ranging from 0.427 eV to 2.636 eV by GGA-PBE approach, while, the estimated band gaps by hybrid HSE06 approach are 0.019 eV–3.360 eV, classifying them as semiconductors and highlighting their potential for photovoltaic and solar energy harvesting applications. The thermodynamic analysis is carried out using Density Functional Perturbation Theory (DFPT), revealed the zero-point energies of the respective compositions as 1.452 eV (La), 1.304 eV (Lu), 1.414 eV (In), and 1.370 eV (Ga). Additionally, the specific heat capacity demonstrates a steady increase with temperature, approaching saturation at 700 K in alignment with the Dulong–Petit law. The optical analysis shows promising results with high optical conductivity (∼6 fs−1), strong absorption in the visible and near-ultraviolet regions (∼105 cm−1), and refractive indices ranging between 3 and 5. Mechanical parameters confirm the ductile nature of the compounds, enhancing their suitability for integration into flexible optoelectronic and photonic devices. This work contributes foundational insights for the advancement of materials tailored for high-efficiency solar cell systems and next-generation energy devices.
在本研究中，通过应用第一线原理计算，对层状钙钛矿的Dion-Jacobson族，特别是CsXNb2O7 （X = La, Lu, In, Ga）化合物进行了全面的分析。利用密度泛函理论（DFT），利用Cu-Kα1单色辐射源（λ = 1.54439 nm）的x射线衍射（XRD）模拟进行了结构细化。在ELF中，由于铯的电荷转移，氧原子有严格限制的区域，ELF值接近1.0，表现出它们的阴离子特征（O2−）。该研究包括通过Perdew-Burke-Ernzerhof （PBE）泛函的广义梯度近似（GGA）深入评估电子、光学、弹性、力学和热力学性质。通过GGA-PBE方法计算得到的带隙范围为0.427 eV ~ 2.636 eV，而混合HSE06方法估计的带隙范围为0.019 eV ~ 3.360 eV，将其归类为半导体，并突出了它们在光伏和太阳能收集方面的应用潜力。利用密度泛函微扰理论（DFPT）进行热力学分析，得到了各组分的零点能分别为1.452 eV （La）、1.304 eV （Lu）、1.414 eV （In）和1.370 eV （Ga）。此外，比热容随着温度的升高而稳定增加，在700k时接近饱和，符合Dulong-Petit定律。光学分析显示出令人鼓舞的结果，具有高的光学导电性（~ 6 fs−1），在可见光和近紫外区域（~ 105 cm−1）的强吸收，折射率在3到5之间。机械参数证实了化合物的延展性，增强了它们集成到柔性光电和光子器件中的适用性。这项工作为高效太阳能电池系统和下一代能源设备量身定制的材料的进步提供了基础见解。
{"title":"Theoretical multifunctional investigations for CsXNb2O7 (X = La, Lu, In and Ga) for next-generation optical devices under visible and UV radiations","authors":"Nawishta Jabeen , Sumaira Zafar , Ahmad Hussain , Irfan Haider , Hamdy Khamees Thabet , Aseel Smerat","doi":"10.1016/j.radphyschem.2026.113596","DOIUrl":"10.1016/j.radphyschem.2026.113596","url":null,"abstract":"<div><div>In this study, a comprehensive analysis is presented for the Dion–Jacobson family of layered perovskites, specifically CsXNb<sub>2</sub>O<sub>7</sub> (X = La, Lu, In, Ga) compounds, through the application of first-principles calculations. Utilizing density functional theory (DFT), structural refinement is conducted via X-ray diffraction (XRD) simulations with a Cu-Kα<sub>1</sub> monochromatic radiation source (λ = 1.54439 nm). In ELF, due to cesium charge transfer, oxygen atoms have tightly restricted areas with ELF values closer to 1.0, showing their anionic character (O<sup>2−</sup>). The investigation encompassed an in-depth evaluation of electronic, optical, elastic, mechanical, and thermodynamic properties by Generalized Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional. The computed electronic band structures reveal that all variants exhibit indirect band gaps ranging from 0.427 eV to 2.636 eV by GGA-PBE approach, while, the estimated band gaps by hybrid HSE06 approach are 0.019 eV–3.360 eV, classifying them as semiconductors and highlighting their potential for photovoltaic and solar energy harvesting applications. The thermodynamic analysis is carried out using Density Functional Perturbation Theory (DFPT), revealed the zero-point energies of the respective compositions as 1.452 eV (La), 1.304 eV (Lu), 1.414 eV (In), and 1.370 eV (Ga). Additionally, the specific heat capacity demonstrates a steady increase with temperature, approaching saturation at 700 K in alignment with the Dulong–Petit law. The optical analysis shows promising results with high optical conductivity (∼6 fs<sup>−1</sup>), strong absorption in the visible and near-ultraviolet regions (∼10<sup>5</sup> cm<sup>−1</sup>), and refractive indices ranging between 3 and 5. Mechanical parameters confirm the ductile nature of the compounds, enhancing their suitability for integration into flexible optoelectronic and photonic devices. This work contributes foundational insights for the advancement of materials tailored for high-efficiency solar cell systems and next-generation energy devices.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113596"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.radphyschem.2025.113586
YanBang Tang
{"title":"Machine Learning-Driven Prediction of Gamma-Ray Shielding Performance in Glasses","authors":"YanBang Tang","doi":"10.1016/j.radphyschem.2025.113586","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.113586","url":null,"abstract":"","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"29 1","pages":"113586"},"PeriodicalIF":2.9,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.radphyschem.2026.113601
T. Rasmi , Rapaka S Chandra Bose , T.S. Varun , K.A. Malini
This study investigates the influence of gamma irradiation on the structural, morphological, and thermoelectric properties of Te based chalcogenides, such as n-type Bi2Te3 and p-type Sb2Te3. Thin films of these materials were prepared via thermal evaporation and exposed to gamma doses of 10 kGy, 20 kGy, and 40 kGy to evaluate the dose dependent changes. X-ray diffraction (XRD) analysis revealed structural modifications, changes in crystallinity and peak profiles with different irradiation doses. Surface morphology and elemental composition were studied using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX). The Hall measurements provide a clear insight into how gamma irradiation affects carrier concentration and mobility of the materials. The thermoelectric performance was calculated by analysing changes in electrical resistivity and Seebeck coefficient with different doses. For n-type Bi2Te3, the highest power factor is obtained (1.59 mW/mK2) at highest dose (40 kGy), whereas the enhanced power factor for p-type Sb2Te3 (2.12 mW/mK2) observed at lower dose (10 kGy). These findings demonstrate that gamma irradiation is a viable method for tuning the thermoelectric properties of telluride based materials, enabling optimization for specific applications.
{"title":"Impact of gamma irradiation on thermoelectric efficiency of Te-based thin films","authors":"T. Rasmi , Rapaka S Chandra Bose , T.S. Varun , K.A. Malini","doi":"10.1016/j.radphyschem.2026.113601","DOIUrl":"10.1016/j.radphyschem.2026.113601","url":null,"abstract":"<div><div>This study investigates the influence of gamma irradiation on the structural, morphological, and thermoelectric properties of Te based chalcogenides, such as n-type Bi<sub>2</sub>Te<sub>3</sub> and p-type Sb<sub>2</sub>Te<sub>3</sub>. Thin films of these materials were prepared via thermal evaporation and exposed to gamma doses of 10 kGy, 20 kGy, and 40 kGy to evaluate the dose dependent changes. X-ray diffraction (XRD) analysis revealed structural modifications, changes in crystallinity and peak profiles with different irradiation doses. Surface morphology and elemental composition were studied using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX). The Hall measurements provide a clear insight into how gamma irradiation affects carrier concentration and mobility of the materials. The thermoelectric performance was calculated by analysing changes in electrical resistivity and Seebeck coefficient with different doses. For n-type Bi<sub>2</sub>Te<sub>3</sub>, the highest power factor is obtained (1.59 mW/mK<sup>2</sup>) at highest dose (40 kGy), whereas the enhanced power factor for p-type Sb<sub>2</sub>Te<sub>3</sub> (2.12 mW/mK<sup>2</sup>) observed at lower dose (10 kGy). These findings demonstrate that gamma irradiation is a viable method for tuning the thermoelectric properties of telluride based materials, enabling optimization for specific applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113601"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-31DOI: 10.1016/j.radphyschem.2025.113582
Viviane Khoury Asfora , Juan Carlos Mora Canadas , Itayana de Albuquerque Lima de Lavor , Daniel Molina , Patricia Mora , Denison Souza-Santos , Leslie Vironneau , Ester Monroy González , Vinícius Saito Monteiro de Barros
As part of its activities, the Network for the Optimization of Occupational Radiological Protection in Latin America and the Caribbean (REPROLAM) promotes interlaboratory comparison exercises to allow Individual Monitoring Services (IMSs) to demonstrate their compliance with standardized limits, validate their measurement methods, monitor the performance of their dosimetry systems, and to support both the attainment and maintenance of ISO/IEC 17025 accreditation. In 2023 REPROLAM launched a new intercomparison open to every External Dosimetry Service willing to participate worldwide, but focusing in the Latin-American and Caribbean countries. This work analyzes the results from the 2023 Intercomparison Exercise for External Dosimetry Services for Extremity and Lens Dosimetry (ICReprolam2023ext&cri). A total of 8 monitoring services with 17 monitoring systems (5 for rings, 3 for wrist and 9 for eye lens dosimetry) from various countries in the region participated in the intercomparison exercise: two services from Argentina, two from Costa Rica, two from Brazil, one from Cuba and one from Nicaragua. The results of the intercomparison were evaluated using the performance limits of ISO 14146:2018 to provide a comprehensive overview of the status of the extremity and eye lens dosimetry capabilities of IMSs in Latin America and the Caribbean. In ring and wrist dosimetry, all participating systems achieved a 100 % compliance rate. For eye lens dosimetry, 77.7 % of the participating systems met the approval criteria. Dosimetry for extremity using rings and wrist monitors are well established within the participating laboratories in the Latin America and Caribbean participating countries reflected by the high compliance rate. For eye lens dosimetry, the results reflect that some of the participants are in the process of establishing and validating protocols, in preparation for future implementation.
{"title":"Analysis of the 2023 Latin-American and Caribbean Intercomparison Exercise for photon dosimetry with extremity and eye lens dosimeters","authors":"Viviane Khoury Asfora , Juan Carlos Mora Canadas , Itayana de Albuquerque Lima de Lavor , Daniel Molina , Patricia Mora , Denison Souza-Santos , Leslie Vironneau , Ester Monroy González , Vinícius Saito Monteiro de Barros","doi":"10.1016/j.radphyschem.2025.113582","DOIUrl":"10.1016/j.radphyschem.2025.113582","url":null,"abstract":"<div><div>As part of its activities, the <em>Network for the Optimization of Occupational Radiological Protection in Latin America and the Caribbean</em> (REPROLAM) promotes interlaboratory comparison exercises to allow Individual Monitoring Services (IMSs) to demonstrate their compliance with standardized limits, validate their measurement methods, monitor the performance of their dosimetry systems, and to support both the attainment and maintenance of ISO/IEC 17025 accreditation. In 2023 REPROLAM launched a new intercomparison open to every External Dosimetry Service willing to participate worldwide, but focusing in the Latin-American and Caribbean countries. This work analyzes the results from the <em>2023 Intercomparison Exercise for External Dosimetry Services for Extremity and Lens Dosimetry</em> (ICReprolam2023<sub>ext&cri</sub>). A total of 8 monitoring services with 17 monitoring systems (5 for rings, 3 for wrist and 9 for eye lens dosimetry) from various countries in the region participated in the intercomparison exercise: two services from Argentina, two from Costa Rica, two from Brazil, one from Cuba and one from Nicaragua. The results of the intercomparison were evaluated using the performance limits of ISO 14146:2018 to provide a comprehensive overview of the status of the extremity and eye lens dosimetry capabilities of IMSs in Latin America and the Caribbean. In ring and wrist dosimetry, all participating systems achieved a 100 % compliance rate. For eye lens dosimetry, 77.7 % of the participating systems met the approval criteria. Dosimetry for extremity using rings and wrist monitors are well established within the participating laboratories in the Latin America and Caribbean participating countries reflected by the high compliance rate. For eye lens dosimetry, the results reflect that some of the participants are in the process of establishing and validating protocols, in preparation for future implementation.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113582"},"PeriodicalIF":2.8,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present investigation focuses on the creation of bamboo-based particleboards integrated with bio-based polyurethane sourced from castor oil and modified used palm oil, further paired with boron additives for dual-mode radiation shielding. The particleboards were developed and extensively assessed for their photon and neutron shielding efficacy, as well as their physical and mechanical properties. Photon attenuation at 60, 81, and 342 keV indicated that the LAC decreased with increasing energy but enhanced with density, reaching a value of 0.71 cm−1 for D1000 at 60 keV. The HVL varied from less than 2 cm at 60 keV to around 14 cm at 342 keV. Neutron shielding studies showed that the hydrogen-rich bamboo structure effectively slowed down fast neutrons and absorbed a lot of thermal neutrons through the 10B (n, α) mechanism. The incorporation of boron content improved the neutron removal cross-section and decreased the HVL. The mechanical studies showed excellent results, with D1000 revealing its highest modulus of elasticity (2500 MPa), which proved that the high-density boards are well-constructed. The results show that boron-modified bamboo particleboards can be used instead of common materials for shielding X-rays, γ-rays, and neutrons because they are lighter, better for the environment, and can be used for more than one thing.
{"title":"Development and structural analysis of boron-doped bamboo-based biocomposites with bio-polyurethane adhesive for dual-mode X-ray and neutron shielding applications","authors":"Nathapong Sukhawipat , Natsupon Chutithanapanon , Vanchai Laemlaksakul , Chadet Yenchai","doi":"10.1016/j.radphyschem.2025.113583","DOIUrl":"10.1016/j.radphyschem.2025.113583","url":null,"abstract":"<div><div>The present investigation focuses on the creation of bamboo-based particleboards integrated with bio-based polyurethane sourced from castor oil and modified used palm oil, further paired with boron additives for dual-mode radiation shielding. The particleboards were developed and extensively assessed for their photon and neutron shielding efficacy, as well as their physical and mechanical properties. Photon attenuation at 60, 81, and 342 keV indicated that the LAC decreased with increasing energy but enhanced with density, reaching a value of 0.71 cm<sup>−1</sup> for D1000 at 60 keV. The HVL varied from less than 2 cm at 60 keV to around 14 cm at 342 keV. Neutron shielding studies showed that the hydrogen-rich bamboo structure effectively slowed down fast neutrons and absorbed a lot of thermal neutrons through the <sup>10</sup>B (n, α) mechanism. The incorporation of boron content improved the neutron removal cross-section and decreased the HVL. The mechanical studies showed excellent results, with D1000 revealing its highest modulus of elasticity (2500 MPa), which proved that the high-density boards are well-constructed. The results show that boron-modified bamboo particleboards can be used instead of common materials for shielding X-rays, γ-rays, and neutrons because they are lighter, better for the environment, and can be used for more than one thing.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113583"},"PeriodicalIF":2.8,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-31DOI: 10.1016/j.radphyschem.2025.113585
Ioanna K. Sfampa , Kassiani Panagiotou , Spyridon Zacharelos , Lamprini Malletzidou , George Kitis
The present study presents a comprehensive thermoluminescence (TL) and prompt isothermal decay (PID) investigation of natural and synthetic ultramarine pigments derived, accordingly, from lapis lazuli of different provenances and commercially produced. The aim is to determine the kinetic parameters of trap centers, clarify the recombination mechanisms and assess the dosimetric potential of these materials. The experimental data were analyzed using both delocalized and localized one-trap one-recombination (OTOR) models, as well as tunneling recombination model, using analytical expressions based on the Lambert W function. In the literature, until now, there is no study that combines TL and PID analyses, using both delocalized and localized OTOR models together with tunneling formulations, to investigate ultramarine pigments from different provenances, leaving the kinetic origin of their luminescence behavior insufficiently resolved. Natural pigments present stable TL responses, with detection limits in the mGy range and nearly linear dose response behavior up to several hundred Gy, highlighting their suitability for applications such as retrospective dosimetry and authentication. One of the natural samples showed continuous glow curves and temperature independent PID behavior consistent with tunneling assisted localized recombination, while the other two samples exhibited discrete peaks suggestive of weakly localized transitions. Synthetic pigments presented significantly lower sensitivity. The results reveal a correlation between mineralogical composition and luminescence behavior, offering valuable insights into provenance discrimination, material authentication and potential use of ultramarine pigments as dosimetric tools.
{"title":"Dosimetric and kinetic characterization of natural and synthetic ultramarine pigments","authors":"Ioanna K. Sfampa , Kassiani Panagiotou , Spyridon Zacharelos , Lamprini Malletzidou , George Kitis","doi":"10.1016/j.radphyschem.2025.113585","DOIUrl":"10.1016/j.radphyschem.2025.113585","url":null,"abstract":"<div><div>The present study presents a comprehensive thermoluminescence (TL) and prompt isothermal decay (PID) investigation of natural and synthetic ultramarine pigments derived, accordingly, from lapis lazuli of different provenances and commercially produced. The aim is to determine the kinetic parameters of trap centers, clarify the recombination mechanisms and assess the dosimetric potential of these materials. The experimental data were analyzed using both delocalized and localized one-trap one-recombination (OTOR) models, as well as tunneling recombination model, using analytical expressions based on the Lambert W function. In the literature, until now, there is no study that combines TL and PID analyses, using both delocalized and localized OTOR models together with tunneling formulations, to investigate ultramarine pigments from different provenances, leaving the kinetic origin of their luminescence behavior insufficiently resolved. Natural pigments present stable TL responses, with detection limits in the mGy range and nearly linear dose response behavior up to several hundred Gy, highlighting their suitability for applications such as retrospective dosimetry and authentication. One of the natural samples showed continuous glow curves and temperature independent PID behavior consistent with tunneling assisted localized recombination, while the other two samples exhibited discrete peaks suggestive of weakly localized transitions. Synthetic pigments presented significantly lower sensitivity. The results reveal a correlation between mineralogical composition and luminescence behavior, offering valuable insights into provenance discrimination, material authentication and potential use of ultramarine pigments as dosimetric tools.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"242 ","pages":"Article 113585"},"PeriodicalIF":2.8,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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