Pub Date : 2026-02-05DOI: 10.1016/j.radphyschem.2026.113660
A.V. Ponomarev, M.M. Belova
The influence of nitric acid and hydrocarbon diluent (from n-hexane to n-pentadecane; as well as isooctane) on the radiolytic formation of phosphorus-containing products in a 30 wt% solution of tri-n-butyl phosphate (TBP) was investigated. The efficient formation of nitro and hydroxy derivatives of TBP with a simultaneous decrease in the yield of alkyl phosphonates and alkyl phosphates is the main difference between the radiolysis of acidified and acid-free solutions. In general, the composition of radiolysis products depends on the diluent. At a dose of up to 30 kGy, the presence of nitric acid in the solution increases the yield of TBP degradation from an average of 74 to 90 nmol J−1, but this yield is practically independent of the number of C atoms in the diluent molecule.
{"title":"The combined effect of nitric acid and hydrocarbon diluent on the radiolytic transformations of tributyl phosphate","authors":"A.V. Ponomarev, M.M. Belova","doi":"10.1016/j.radphyschem.2026.113660","DOIUrl":"10.1016/j.radphyschem.2026.113660","url":null,"abstract":"<div><div>The influence of nitric acid and hydrocarbon diluent (from n-hexane to n-pentadecane; as well as isooctane) on the radiolytic formation of phosphorus-containing products in a 30 wt% solution of tri-<em>n</em>-butyl phosphate (TBP) was investigated. The efficient formation of nitro and hydroxy derivatives of TBP with a simultaneous decrease in the yield of alkyl phosphonates and alkyl phosphates is the main difference between the radiolysis of acidified and acid-free solutions. In general, the composition of radiolysis products depends on the diluent. At a dose of up to 30 kGy, the presence of nitric acid in the solution increases the yield of TBP degradation from an average of 74 to 90 nmol J<sup>−1</sup>, but this yield is practically independent of the number of C atoms in the diluent molecule.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113660"},"PeriodicalIF":2.8,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134655","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 : 2026-02-04DOI: 10.1016/j.radphyschem.2026.113662
Ruzan Sukiasyan , Mane Sahakyan , Nelli Gharibyan , Armen Ayvazyan , Kyrill Suponitsky , Astghik Danghyan , Armen Atanesyan
In this work, L-arginine sulfates (LAS and LAS∙2H2O) were studied both experimentally and theoretically. The crystal and molecular structure of LAS and LAS∙2H2O were determined by single-crystal X-ray diffraction method at 120 K and 295 K. It was shown that the crystals LAS (L-Arg2+)∙(SO42−) and LAS∙2H2O ((L-Arg2+)∙(SO42−)∙2H2O) crystallize in the orthorhombic (space group P21212) and monoclinic (space group P21) systems, respectively. First-principles calculations of dielectric and optical properties, as well as the structural computational optimization procedure, were performed. The UV-Vis transmittance spectrum was recorded, and the second harmonic generation efficiency was investigated. Theoretical results for the optical properties were compared with experimental data․
{"title":"Theoretical and experimental study of L-arginine sulfates","authors":"Ruzan Sukiasyan , Mane Sahakyan , Nelli Gharibyan , Armen Ayvazyan , Kyrill Suponitsky , Astghik Danghyan , Armen Atanesyan","doi":"10.1016/j.radphyschem.2026.113662","DOIUrl":"10.1016/j.radphyschem.2026.113662","url":null,"abstract":"<div><div>In this work, L-arginine sulfates (LAS and LAS∙2H<sub>2</sub>O) were studied both experimentally and theoretically. The crystal and molecular structure of LAS and LAS∙2H<sub>2</sub>O were determined by single-crystal X-ray diffraction method at 120 K and 295 K. It was shown that the crystals LAS (L-Arg<sup>2+</sup>)∙(SO<sub>4</sub><sup>2−</sup>) and LAS∙2H<sub>2</sub>O ((L-Arg<sup>2+</sup>)∙(SO<sub>4</sub><sup>2−</sup>)∙2H<sub>2</sub>O) crystallize in the orthorhombic (space group <em>P</em>2<sub>1</sub>2<sub>1</sub>2) and monoclinic (space group <em>P</em>2<sub>1</sub>) systems, respectively. First-principles calculations of dielectric and optical properties, as well as the structural computational optimization procedure, were performed. The UV-Vis transmittance spectrum was recorded, and the second harmonic generation efficiency was investigated. Theoretical results for the optical properties were compared with experimental data․</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113662"},"PeriodicalIF":2.8,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134659","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 : 2026-02-03DOI: 10.1016/j.radphyschem.2026.113689
Anand Kumar Sethukali , Dongbin Park , Cheorun Jo , Hyun Jung Lee
In this study, semi-moist pet food samples were irradiated with electron beam and X-rays at 0, 2.5, 5, and 10 kGy. Samples were stored under refrigeration, and volatile compounds were analyzed on days 0 and 60. X-ray irradiation produced more volatile compounds than electron beam, likely due to differences in free radical formation and radiation-matter interaction characteristics. A dose of 10 kGy promoted oxidative reactions, increasing aldehydes, ketones, and carboxylic compounds, while 5 kGy resulted in more alkanes, indicating hydrocarbon breakdown and distinct flavor development. Notably, 1,3-di-tert-butylbenzene increased consistently at 10 kGy compared to controls, suggesting formation through packaging antioxidant degradation and migration into the fat matrix, supporting its potential role as an irradiation- and packaging-related marker in semi-moist pet foods. Storage conditions significantly influenced volatile compound changes, emphasizing the need for further investigation. These results highlight the importance of optimizing irradiation dose and storage conditions to ensure the safety and quality of semi-moist pet foods, with volatile compound profiles used as chemical indicators of potential sensory changes relevant to product quality.
{"title":"Understanding key volatiles in semi-moist pet foods treated with electron beam and X-ray irradiation","authors":"Anand Kumar Sethukali , Dongbin Park , Cheorun Jo , Hyun Jung Lee","doi":"10.1016/j.radphyschem.2026.113689","DOIUrl":"10.1016/j.radphyschem.2026.113689","url":null,"abstract":"<div><div>In this study, semi-moist pet food samples were irradiated with electron beam and X-rays at 0, 2.5, 5, and 10 kGy. Samples were stored under refrigeration, and volatile compounds were analyzed on days 0 and 60. X-ray irradiation produced more volatile compounds than electron beam, likely due to differences in free radical formation and radiation-matter interaction characteristics. A dose of 10 kGy promoted oxidative reactions, increasing aldehydes, ketones, and carboxylic compounds, while 5 kGy resulted in more alkanes, indicating hydrocarbon breakdown and distinct flavor development. Notably, 1,3-di-<em>tert</em>-butylbenzene increased consistently at 10 kGy compared to controls, suggesting formation through packaging antioxidant degradation and migration into the fat matrix, supporting its potential role as an irradiation- and packaging-related marker in semi-moist pet foods. Storage conditions significantly influenced volatile compound changes, emphasizing the need for further investigation. These results highlight the importance of optimizing irradiation dose and storage conditions to ensure the safety and quality of semi-moist pet foods, with volatile compound profiles used as chemical indicators of potential sensory changes relevant to product quality.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113689"},"PeriodicalIF":2.8,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110479","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 : 2026-02-03DOI: 10.1016/j.radphyschem.2026.113646
Mehmet Bektasoglu , Abdullah S. Bayraktar
We introduce GRASP-X, a fast and user-friendly online tool for computing key gamma-ray shielding parameters, including the mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), and effective atomic number (). GRASP-X is based on the previously developed offline version ”GRASP” and is freely accessible at https://nuclearandparticle.sakarya.edu.tr/grasp-x. The tool computes these parameters at both standard gamma-ray energies and absorption edges, producing graphical outputs and downloadable tables in approximately one second. To evaluate its performance, a wide range of previously studied materials — including glasses and composites — was analyzed. MACs, HVLs, and values obtained with GRASP-X were benchmarked against results from established computational tools, experimental measurements, and theoretical predictions. GRASP-X shows excellent agreement with XCOM across nearly the entire gamma-ray energy range, including absorption edges, and its MAC results are consistent with those calculated using simulation codes such as PHITS and MCNP6. Although direct comparison with Phy-X at absorption edges was limited by the absence of corresponding data, GRASP-X results agree well with Phy-X at standard energies. The effective atomic numbers computed by GRASP-X also exhibit strong consistency with those from Auto-, particularly within the Compton interaction regime.
{"title":"GRASP-X: A user-friendly web-based code to compute various gamma shielding parameters","authors":"Mehmet Bektasoglu , Abdullah S. Bayraktar","doi":"10.1016/j.radphyschem.2026.113646","DOIUrl":"10.1016/j.radphyschem.2026.113646","url":null,"abstract":"<div><div>We introduce GRASP-X, a fast and user-friendly online tool for computing key gamma-ray shielding parameters, including the mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), and effective atomic number (<span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>eff</mi></mrow></msub></math></span>). GRASP-X is based on the previously developed offline version ”GRASP” and is freely accessible at <span><span>https://nuclearandparticle.sakarya.edu.tr/grasp-x</span><svg><path></path></svg></span>. The tool computes these parameters at both standard gamma-ray energies and absorption edges, producing graphical outputs and downloadable tables in approximately one second. To evaluate its performance, a wide range of previously studied materials — including glasses and composites — was analyzed. MACs, HVLs, and <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>eff</mi></mrow></msub></math></span> values obtained with GRASP-X were benchmarked against results from established computational tools, experimental measurements, and theoretical predictions. GRASP-X shows excellent agreement with XCOM across nearly the entire gamma-ray energy range, including absorption edges, and its MAC results are consistent with those calculated using simulation codes such as PHITS and MCNP6. Although direct comparison with Phy-X at absorption edges was limited by the absence of corresponding data, GRASP-X results agree well with Phy-X at standard energies. The effective atomic numbers computed by GRASP-X also exhibit strong consistency with those from Auto-<span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></math></span>, particularly within the Compton interaction regime.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113646"},"PeriodicalIF":2.8,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110481","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 : 2026-02-02DOI: 10.1016/j.radphyschem.2026.113682
Eda Kaya Pepele , Songül Barlaz Us
Objective
To quantitatively evaluate the modulation of the maximum (D_max), mean (D_mean), and minimum (D_min) dose response at different tissue densities by field width (FW) and pitch factor in helical tomotherapy in a multi density phantom and to characterize the mass density dose relationship using single breakpoint piecewise linear models.
Materials and methods
Helical tomotherapy plans were generated on a cylindrical “cheese” phantom containing inserts with eight different mass densities representing lung, soft-tissue, and bone like regions for three FW values (1.0, 2.5, and 5.0 cm) and four pitch values. The modulation factor was maintained. For each combination, the D_max, D_mean, and D_min values for the inserts were recorded and analyzed using simple linear and single breakpoint piecewise linear models, with mass density as the independent variable and the dose metrics as the dependent variables. Model fit was assessed using the Akaike information criterion (AIC) and coefficient of determination (R2), and factor effects were evaluated using a multifactor ANOVA.
Results
Across all FW–pitch combinations, the mass density–dose relationship exhibited a clearly non-linear inverted V profile. Piecewise models, particularly for D_max and D_mean, outperformed linear models, with lower AIC and higher R2 values. The breakpoints were mostly clustered around the water-equivalent regions. In the ANOVA, the mass density, dose metrics, and FW showed significant main effects, whereas the main effect of pitch was not significant within the investigated range of values.
Conclusion
The findings obtained in the multi-density phantom indicate that the dominant determinant of density dependent dose response in helical tomotherapy is tissue mass density, whereas FW and pitch behave as geometric parameters that secondarily modulate the dose response while preserving an inverted V baseline profile.
{"title":"Density-dependent dose response to field width and pitch variations in helical tomotherapy: a multi-density phantom and piecewise regression analysis","authors":"Eda Kaya Pepele , Songül Barlaz Us","doi":"10.1016/j.radphyschem.2026.113682","DOIUrl":"10.1016/j.radphyschem.2026.113682","url":null,"abstract":"<div><h3>Objective</h3><div>To quantitatively evaluate the modulation of the maximum (D_max), mean (D_mean), and minimum (D_min) dose response at different tissue densities by field width (FW) and pitch factor in helical tomotherapy in a multi density phantom and to characterize the mass density dose relationship using single breakpoint piecewise linear models.</div></div><div><h3>Materials and methods</h3><div>Helical tomotherapy plans were generated on a cylindrical “cheese” phantom containing inserts with eight different mass densities representing lung, soft-tissue, and bone like regions for three FW values (1.0, 2.5, and 5.0 cm) and four pitch values. The modulation factor was maintained. For each combination, the D_max, D_mean, and D_min values for the inserts were recorded and analyzed using simple linear and single breakpoint piecewise linear models, with mass density as the independent variable and the dose metrics as the dependent variables. Model fit was assessed using the Akaike information criterion (AIC) and coefficient of determination (R<sup>2</sup>), and factor effects were evaluated using a multifactor ANOVA.</div></div><div><h3>Results</h3><div>Across all FW–pitch combinations, the mass density–dose relationship exhibited a clearly non-linear inverted V profile. Piecewise models, particularly for D_max and D_mean, outperformed linear models, with lower AIC and higher R<sup>2</sup> values. The breakpoints were mostly clustered around the water-equivalent regions. In the ANOVA, the mass density, dose metrics, and FW showed significant main effects, whereas the main effect of pitch was not significant within the investigated range of values.</div></div><div><h3>Conclusion</h3><div>The findings obtained in the multi-density phantom indicate that the dominant determinant of density dependent dose response in helical tomotherapy is tissue mass density, whereas FW and pitch behave as geometric parameters that secondarily modulate the dose response while preserving an inverted V baseline profile.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113682"},"PeriodicalIF":2.8,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110484","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 : 2026-02-01DOI: 10.1016/j.radphyschem.2026.113686
Hector Rene Vega-Carrillo , Samah A. Al-Shelkamy , Claudia Angelica Marquez-Mata , Carina Oliva Torres-Cortes , Victor Martin Hernandez-Davila , Miguel Angel Salas-Luevano
Seven shape memory alloys, together with AISI 321 stainless steel and polyethylene, were investigated as moderators for a241Am–Be neutron source. Monte Carlo simulations were performed to estimate the neutron spectra at 100 cm from the source, with the aim of producing realistic neutron radiation fields comprising thermal, epithermal, and fast neutrons suitable for calibration of neutron radiation protection instruments. In addition, γ-ray spectra induced by neutron interactions with, the source, alloy, steel, and polyethylene nuclei were evaluated. Using the calculated neutron spectra, the ambient dose equivalent, isotropic effective dose, and ambient dose were determined, while the ambient dose equivalent and ambient dose were also calculated for the γ-ray spectra. The neutron spectra of alloy-moderated 241Am–Be sources, including configurations with thin and thick polyethylene shells, exhibited neutron absorption features associated with 55Mn present in all alloys. Neutron spectra produced by thin and thick alloy shell–polyethylene moderated 241Am–Be sources showed well-defined thermal, epithermal, and fast neutron components, with mean neutron energies ranging from 1.53 to 2.48 MeV. Among the investigated configurations, the thick ASH4P/241Am–Be source produced the highest neutron fluence, with a mean energy of approximately 2.16 MeV and a balanced contribution of thermal, epithermal, and fast neutrons. These results demonstrate that shape memory alloys, in combination with polyethylene, can be effectively used to tailor 241Am–Be neutron fields, enabling the generation of realistic spectral and dosimetric characteristics suitable for extending the calibration capabilities of neutron calibration facilities.
{"title":"Spectra and dosimetric features of Shape Memory Alloys moderated 241Am–Be neutron sources for calibration","authors":"Hector Rene Vega-Carrillo , Samah A. Al-Shelkamy , Claudia Angelica Marquez-Mata , Carina Oliva Torres-Cortes , Victor Martin Hernandez-Davila , Miguel Angel Salas-Luevano","doi":"10.1016/j.radphyschem.2026.113686","DOIUrl":"10.1016/j.radphyschem.2026.113686","url":null,"abstract":"<div><div>Seven shape memory alloys, together with AISI 321 stainless steel and polyethylene, were investigated as moderators for a<sup>241</sup>Am–Be neutron source. Monte Carlo simulations were performed to estimate the neutron spectra at 100 cm from the source, with the aim of producing realistic neutron radiation fields comprising thermal, epithermal, and fast neutrons suitable for calibration of neutron radiation protection instruments. In addition, γ-ray spectra induced by neutron interactions with, the source, alloy, steel, and polyethylene nuclei were evaluated. Using the calculated neutron spectra, the ambient dose equivalent, isotropic effective dose, and ambient dose were determined, while the ambient dose equivalent and ambient dose were also calculated for the γ-ray spectra. The neutron spectra of alloy-moderated <sup>241</sup>Am–Be sources, including configurations with thin and thick polyethylene shells, exhibited neutron absorption features associated with <sup>55</sup>Mn present in all alloys. Neutron spectra produced by thin and thick alloy shell–polyethylene moderated <sup>241</sup>Am–Be sources showed well-defined thermal, epithermal, and fast neutron components, with mean neutron energies ranging from 1.53 to 2.48 MeV. Among the investigated configurations, the thick A<sub>SH4</sub>P/<sup>241</sup>Am–Be source produced the highest neutron fluence, with a mean energy of approximately 2.16 MeV and a balanced contribution of thermal, epithermal, and fast neutrons. These results demonstrate that shape memory alloys, in combination with polyethylene, can be effectively used to tailor <sup>241</sup>Am–Be neutron fields, enabling the generation of realistic spectral and dosimetric characteristics suitable for extending the calibration capabilities of neutron calibration facilities.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113686"},"PeriodicalIF":2.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146110485","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 precise delivery of radiation dose to tumors while sparing healthy tissues is a cornerstone of effective radiotherapy, demanding rigorous pre-treatment validation. Dosimetric phantoms are essential tools for this validation, yet conventional designs often lack anatomical realism. This study addresses the need for more patient-specific and accessible quality assurance tools by developing and evaluating a 3D-printed head phantom. It was hypothesized that a universal head phantom fabricated via fused filament fabrication from polylactic acid could provide dosimetric accuracy comparable to clinical standards. The phantom was designed, printed, and then underwent a full cycle of radiation therapy: CT simulation, planning of radiation therapy with intensity modulation (IMRT) and arc modulation (VMAT), irradiation with photon beams of 6 and 10 MeV. Dose was measured using a farmer-type ionization chamber and radiochromic films. The results showed excellent agreement between measured and planned doses, with deviations of less than 1% for point measurements and a gamma analysis passing rate exceeding 95% (3%/3 mm criteria) for 2D dose distributions. These findings confirm that the developed 3D-printed phantom is a reliable and versatile tool, demonstrating significant potential for enhancing quality assurance procedures in clinical radiotherapy and for facilitating controlled dosimetric research.
{"title":"Validating photon beam delivery by 3D-printed head phantom","authors":"Daria Polomoshnova , Angelina Bulavskaya , Irina Miloichikova , Faustina Ntim Opoku , Sergei Stuchebrov","doi":"10.1016/j.radphyschem.2026.113683","DOIUrl":"10.1016/j.radphyschem.2026.113683","url":null,"abstract":"<div><div>The precise delivery of radiation dose to tumors while sparing healthy tissues is a cornerstone of effective radiotherapy, demanding rigorous pre-treatment validation. Dosimetric phantoms are essential tools for this validation, yet conventional designs often lack anatomical realism. This study addresses the need for more patient-specific and accessible quality assurance tools by developing and evaluating a 3D-printed head phantom. It was hypothesized that a universal head phantom fabricated via fused filament fabrication from polylactic acid could provide dosimetric accuracy comparable to clinical standards. The phantom was designed, printed, and then underwent a full cycle of radiation therapy: CT simulation, planning of radiation therapy with intensity modulation (IMRT) and arc modulation (VMAT), irradiation with photon beams of 6 and 10 MeV. Dose was measured using a farmer-type ionization chamber and radiochromic films. The results showed excellent agreement between measured and planned doses, with deviations of less than 1% for point measurements and a gamma analysis passing rate exceeding 95% (3%/3 mm criteria) for 2D dose distributions. These findings confirm that the developed 3D-printed phantom is a reliable and versatile tool, demonstrating significant potential for enhancing quality assurance procedures in clinical radiotherapy and for facilitating controlled dosimetric research.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113683"},"PeriodicalIF":2.8,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146095728","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 : 2026-01-31DOI: 10.1016/j.radphyschem.2026.113650
Shahad Alrushud, Amjad Almutairi, Madhawi Alkahtani, Hiba Omer, Hind Toufig, Ali Alghamdi
{"title":"Implementing VMAT for Total Body Irradiation in a 3-Year-Old Patient: Clinical Workflow and Positioning Challenges","authors":"Shahad Alrushud, Amjad Almutairi, Madhawi Alkahtani, Hiba Omer, Hind Toufig, Ali Alghamdi","doi":"10.1016/j.radphyschem.2026.113650","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2026.113650","url":null,"abstract":"","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"34 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089318","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 release of radon and thoron from building materials is presently a concern as a source of indoor radiation exposure, which causes substantial long-term health risks to the public. This research presented a novel sustainable radon barrier based on natural rubber latex (NRL) emulsion coating, which was crosslinked using glutaraldehyde and filled with varying contents of silicon dioxide (SiO2) or activated carbon (AC). The emulsion was coated (0.20 ± 0.10 mm dry thickness) on clay bricks and subsequently evaluated for their ability to mitigate radon and thoron exhalation. The results showed that the 10-phr SiO2-filled sample achieved the highest radon mitigation efficiency of 60.3% in surface radon exhalation rate relative to the uncoated condition, while all formulations, including pristine NRL, achieved thoron suppression efficiencies greater than 92%. Furthermore, simulated dose assessments confirmed the coating's effectiveness in reducing annual effective dose (AED) from indoor radon, with further reductions to 0.10–0.15 mSv·y−1 achieved under ventilated scenarios. Beyond radon and thoron barrier performance, SiO2 incorporation markedly enhanced mechanical robustness and abrasion resistance, while AC improved coating elasticity, although high AC contents led to agglomeration and reduced film uniformity. These findings highlight the potential of sustainable, ambient-curable NRL coatings as effective practical and durable barriers against indoor radon and thoron for green building applications.
{"title":"Enhanced radon and thoron-barrier performance of ambient‒curable natural rubber latex for sustainable building material coatings","authors":"Worawat Poltabtim , Suchart Kothan , Tarika Thumvijit , Chayanit Jumpee , Siriprapa Somboon , Benjamaporn Supawat , Phannavich Malawan , Kiadtisak Saenboonruang","doi":"10.1016/j.radphyschem.2026.113680","DOIUrl":"10.1016/j.radphyschem.2026.113680","url":null,"abstract":"<div><div>The release of radon and thoron from building materials is presently a concern as a source of indoor radiation exposure, which causes substantial long-term health risks to the public. This research presented a novel sustainable radon barrier based on natural rubber latex (NRL) emulsion coating, which was crosslinked using glutaraldehyde and filled with varying contents of silicon dioxide (SiO<sub>2</sub>) or activated carbon (AC). The emulsion was coated (0.20 ± 0.10 mm dry thickness) on clay bricks and subsequently evaluated for their ability to mitigate radon and thoron exhalation. The results showed that the 10-phr SiO<sub>2</sub>-filled sample achieved the highest radon mitigation efficiency of 60.3% in surface radon exhalation rate relative to the uncoated condition, while all formulations, including pristine NRL, achieved thoron suppression efficiencies greater than 92%. Furthermore, simulated dose assessments confirmed the coating's effectiveness in reducing annual effective dose (AED) from indoor radon, with further reductions to 0.10–0.15 mSv·y<sup>−1</sup> achieved under ventilated scenarios. Beyond radon and thoron barrier performance, SiO<sub>2</sub> incorporation markedly enhanced mechanical robustness and abrasion resistance, while AC improved coating elasticity, although high AC contents led to agglomeration and reduced film uniformity. These findings highlight the potential of sustainable, ambient-curable NRL coatings as effective practical and durable barriers against indoor radon and thoron for green building applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"243 ","pages":"Article 113680"},"PeriodicalIF":2.8,"publicationDate":"2026-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089317","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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