Pub Date : 2024-11-20DOI: 10.1016/j.radphyschem.2024.112415
Taotao Ji, Zhao Xu, Yuanyuan Zhou, Weiyue Yu, Taosheng Li, Yanyan Yang, Bing Hong
Monte Carlo calculations are extensively used in the fields of nanodosimetry and DNA damage research. Presently, the focus of DNA repair simulation studies is predominantly on the temporal aspects of the repair process, the impact of radiation dose on DNA repair requires further investigation. Caenorhabditis elegans (C.elegans) is one of the important model organisms in radiation biology research, and its germ cells are closely related to the DNA damage. Using the Hilbert curve, the DNA germ cell of C. elegans was constructed, and the double-strand breaks (DSB) yields quantified by Geant4-DNA. After comparing the simulation results of total DNA damage and cluster damage with biological data, it was found that the simulation results of cluster damage are close to the biological data. The number of DSBs induced by 137Cs radiation was further compared with experimental data at different doses and proposed a damage repair model for the number of DSBs in the germ cell of C.elegans that is related to the dose.The repair fitting was conducted for both total DSB damages and DSB cluster damages. After the application of the repair model fitting for the two types of DNA damage mentioned above, the results matched well with the corresponding biological experimental data (R2 > 0.950).
蒙特卡洛计算被广泛应用于纳米模拟和 DNA 损伤研究领域。目前，DNA 修复模拟研究的重点主要集中在修复过程的时间方面，辐射剂量对 DNA 修复的影响还需要进一步研究。秀丽隐杆线虫（C.elegans）是辐射生物学研究的重要模式生物之一，其生殖细胞与DNA损伤密切相关。利用希尔伯特曲线构建了秀丽隐杆线虫的 DNA 生殖细胞，并通过 Geant4-DNA 对双链断裂（DSB）的产量进行了量化。将 DNA 总损伤和集束损伤的模拟结果与生物数据进行比较后发现，集束损伤的模拟结果与生物数据接近。进一步将 137Cs 辐射诱导的 DSB 数量与不同剂量下的实验数据进行了比较，并提出了秀丽隐杆线虫生殖细胞中 DSB 数量与剂量相关的损伤修复模型。对上述两种类型的DNA损伤进行修复模型拟合后，结果与相应的生物实验数据十分吻合（R2 > 0.950）。
{"title":"Nanodosimetric study of the γ-ray damage repair model based on the germ cell of Caenorhabditis elegans","authors":"Taotao Ji, Zhao Xu, Yuanyuan Zhou, Weiyue Yu, Taosheng Li, Yanyan Yang, Bing Hong","doi":"10.1016/j.radphyschem.2024.112415","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112415","url":null,"abstract":"Monte Carlo calculations are extensively used in the fields of nanodosimetry and DNA damage research. Presently, the focus of DNA repair simulation studies is predominantly on the temporal aspects of the repair process, the impact of radiation dose on DNA repair requires further investigation. <ce:italic>Caenorhabditis elegans</ce:italic> (<ce:italic>C.elegans</ce:italic>) is one of the important model organisms in radiation biology research, and its germ cells are closely related to the DNA damage. Using the Hilbert curve, the DNA germ cell of <ce:italic>C. elegans</ce:italic> was constructed, and the double-strand breaks (DSB) yields quantified by Geant4-DNA. After comparing the simulation results of total DNA damage and cluster damage with biological data, it was found that the simulation results of cluster damage are close to the biological data. The number of DSBs induced by <ce:sup loc=\"post\">137</ce:sup>Cs radiation was further compared with experimental data at different doses and proposed a damage repair model for the number of DSBs in the germ cell of <ce:italic>C.elegans</ce:italic> that is related to the dose.The repair fitting was conducted for both total DSB damages and DSB cluster damages. After the application of the repair model fitting for the two types of DNA damage mentioned above, the results matched well with the corresponding biological experimental data (R<ce:sup loc=\"post\">2</ce:sup> > 0.950).","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"59 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691153","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 : 2024-11-20DOI: 10.1016/j.radphyschem.2024.112410
Traian Zaharescu, Aurora Crăciun, Radu Mirea
This paper presents the appraisal on the stabilization effects of some natural antioxidants, NAO (kelp, quercetin and rosemary extract) added in ethylene-propylene copolymer (EPR) subjected to an accelerated oxidative degradation initiated by γ-irradiation. The improvement contribution of polyhedral oligomeric silsesquioxane (POSS) in the coupling additives is also investigated. The applied experimental procedures (isothermal and nonisothermal chemiluminescence) allow the kinetic characterization of the protection activities initiated by their peculiar antioxidative interactions. The stabilization efficiencies are obtained by the modifications of the degradation parameters: oxidation induction time and onset oxidation temperature by means of their significant adjustments that demonstrate the material strength improvement. The amelioration of the evaluated thermal behavior is obtained by the presence of 1 wt% studied additives and POSS, which control the extended life of polymer packaging. The material durabilities expressed by the activation energies required by the modified EPR formulations for stability promotion are calculated. Our study reveals some ecological solutions for the manufacture of high performance materials available for packaging purposes, through which the modifications of EPR by quercetin and quercetin/POSS compounds provide the most efficient solution.
{"title":"Controlled degradation of EPR by natural antioxidant/POSS couples for packaging materials","authors":"Traian Zaharescu, Aurora Crăciun, Radu Mirea","doi":"10.1016/j.radphyschem.2024.112410","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112410","url":null,"abstract":"This paper presents the appraisal on the stabilization effects of some natural antioxidants, NAO (kelp, quercetin and rosemary extract) added in ethylene-propylene copolymer (EPR) subjected to an accelerated oxidative degradation initiated by γ-irradiation. The improvement contribution of polyhedral oligomeric silsesquioxane (POSS) in the coupling additives is also investigated. The applied experimental procedures (isothermal and nonisothermal chemiluminescence) allow the kinetic characterization of the protection activities initiated by their peculiar antioxidative interactions. The stabilization efficiencies are obtained by the modifications of the degradation parameters: oxidation induction time and onset oxidation temperature by means of their significant adjustments that demonstrate the material strength improvement. The amelioration of the evaluated thermal behavior is obtained by the presence of 1 wt% studied additives and POSS, which control the extended life of polymer packaging. The material durabilities expressed by the activation energies required by the modified EPR formulations for stability promotion are calculated. Our study reveals some ecological solutions for the manufacture of high performance materials available for packaging purposes, through which the modifications of EPR by quercetin and quercetin/POSS compounds provide the most efficient solution.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"18 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691142","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 : 2024-11-20DOI: 10.1016/j.radphyschem.2024.112417
Er-Lei Ye, Yong-Fang Lai, Chun-Xia Shen, Yi-Jie Hou, Hong-Jie Nan
Nowadays Si & SiO2 have been the most widely used materials in semiconductor devices as CPU and other various integrated circuit chips, utilized in aerospace electronic systems, and at the same time protons are important components of cosmic rays that can cause displacement damage in Si & SiO2. Therefore, it is essential to study the displacement damage of Si & SiO2 caused by protons. The software of Geant4 is adopted in this paper, to simulate transportation process of incident protons with different energy in Si & SiO2. The simulation results indicates that primary knock-on atom (PKA) generated by incident proton in Si & SiO2 is predominant in lower energy range, its spatial distribution increases gradually along the direction of incident proton, and the scattering angle of the PKA is about 90°, following a Gaussian distribution approximately. And in lower energy range, 28Si and 16O generated by elastic scattering are a primary source of radiation damage in Si & SiO2. But as the proton energy increases, the contribution of nuclear inelastic scattering becomes more and more important, but the overall level of induced damage diminishes gradually. Meanwhile, the simulation results indicate that with increasing depth of the material, the non-ionizing energy loss (NIEL) increases gradually, and NIEL caused by elastic scattering is higher near the surface layer of the materials, and as for NIEL caused by nuclear inelastic scattering is also higher near the surface layer of the materials. The simulation results in this paper can provide useful data and theoretical guidance for study on Si & SiO2 displacement damage caused by proton irradiation.
如今，Si & SiO2 已成为半导体器件中应用最广泛的材料，如 CPU 和其他各种集成电路芯片，在航空航天电子系统中也有应用，同时质子是宇宙射线的重要组成部分，会对 Si & SiO2 造成位移损伤。因此，研究质子对 Si & SiO2 造成的位移损伤十分必要。本文采用 Geant4 软件模拟了不同能量的入射质子在 Si & SiO2 中的迁移过程。模拟结果表明，入射质子在Si & SiO2中产生的原叩原子（PKA）在较低能量范围内占优势，其空间分布沿入射质子方向逐渐增大，PKA的散射角约为90°，近似于高斯分布。而在较低的能量范围内，弹性散射产生的 28Si 和 16O 是 Si & SiO2 辐射损伤的主要来源。但随着质子能量的增加，核非弹性散射的贡献变得越来越重要，但诱导损伤的总体水平逐渐降低。同时，模拟结果表明，随着材料深度的增加，非电离能量损耗（NIEL）逐渐增加，弹性散射引起的非电离能量损耗在材料表层附近较高，而核非弹性散射引起的非电离能量损耗在材料表层附近也较高。本文的模拟结果可为研究质子辐照造成的 Si & SiO2 位移损伤提供有用的数据和理论指导。
{"title":"Simulation of displacement damage in Si & SiO2 caused by protons","authors":"Er-Lei Ye, Yong-Fang Lai, Chun-Xia Shen, Yi-Jie Hou, Hong-Jie Nan","doi":"10.1016/j.radphyschem.2024.112417","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112417","url":null,"abstract":"Nowadays Si & SiO<ce:inf loc=\"post\">2</ce:inf> have been the most widely used materials in semiconductor devices as CPU and other various integrated circuit chips, utilized in aerospace electronic systems, and at the same time protons are important components of cosmic rays that can cause displacement damage in Si & SiO<ce:inf loc=\"post\">2</ce:inf>. Therefore, it is essential to study the displacement damage of Si & SiO<ce:inf loc=\"post\">2</ce:inf> caused by protons. The software of Geant4 is adopted in this paper, to simulate transportation process of incident protons with different energy in Si & SiO<ce:inf loc=\"post\">2</ce:inf>. The simulation results indicates that primary knock-on atom (PKA) generated by incident proton in Si & SiO<ce:inf loc=\"post\">2</ce:inf> is predominant in lower energy range, its spatial distribution increases gradually along the direction of incident proton, and the scattering angle of the PKA is about 90°, following a Gaussian distribution approximately. And in lower energy range, <ce:sup loc=\"post\">28</ce:sup>Si and <ce:sup loc=\"post\">16</ce:sup>O generated by elastic scattering are a primary source of radiation damage in Si & SiO<ce:inf loc=\"post\">2</ce:inf>. But as the proton energy increases, the contribution of nuclear inelastic scattering becomes more and more important, but the overall level of induced damage diminishes gradually. Meanwhile, the simulation results indicate that with increasing depth of the material, the non-ionizing energy loss (NIEL) increases gradually, and NIEL caused by elastic scattering is higher near the surface layer of the materials, and as for NIEL caused by nuclear inelastic scattering is also higher near the surface layer of the materials. The simulation results in this paper can provide useful data and theoretical guidance for study on Si & SiO<ce:inf loc=\"post\">2</ce:inf> displacement damage caused by proton irradiation.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"255 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691141","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}
Wastewater from the coal chemical industry contains large amounts of refractory organic compounds that pose a serious threat to the environment. This paper proposes a pre-treatment method based on gamma irradiation to improve the biodegradation characteristics of coal chemical industry wastewater. Samples containing phenol, hydroquinone, p-cresol, and quinoline were irradiated using 60Co gamma source at an absorbed dose of 20 kGy. The results showed that the chemical oxygen demand slightly decreased with increasing absorbed dose, whereas the BOD5/COD ratio increased from 0.044 to 0.310, indicating a significant enhancement in biodegradability induced by gamma irradiation. Anaerobic digestion tests showed that the cumulative gas production for wastewater samples with initial concentrations of 40, 60, and 80 mg/L increased by 161.78%, 64.07%, and 35.51%, respectively, at 20 kGy, compared to that for the unirradiated samples. The ultraviolet spectrum analysis and infrared spectrum analysis results showed that the concentrations of aldehyde and ketone small molecule organics increased, and there were more biodegradable organic substances in the wastewater samples after irradiation. Microbial colony analysis revealed beneficial changes in the methanogenic archaea during the Anaerobic digestion (AD) process and increased the stability of the anaerobic fermentation system.
{"title":"Effects of ionizing irradiation on biodegradation characteristics of synthetic coal chemical industry wastewater","authors":"Zhen Li, Jiaxin Liu, Wenbao Jia, Chao Zhou, Lingxi Li, Daqian Hei, Qing Shan, Xiaojun Zhang, Yongsheng Ling","doi":"10.1016/j.radphyschem.2024.112414","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112414","url":null,"abstract":"Wastewater from the coal chemical industry contains large amounts of refractory organic compounds that pose a serious threat to the environment. This paper proposes a pre-treatment method based on gamma irradiation to improve the biodegradation characteristics of coal chemical industry wastewater. Samples containing phenol, hydroquinone, p-cresol, and quinoline were irradiated using <ce:sup loc=\"post\">60</ce:sup>Co gamma source at an absorbed dose of 20 kGy. The results showed that the chemical oxygen demand slightly decreased with increasing absorbed dose, whereas the BOD<ce:inf loc=\"post\">5</ce:inf>/COD ratio increased from 0.044 to 0.310, indicating a significant enhancement in biodegradability induced by gamma irradiation. Anaerobic digestion tests showed that the cumulative gas production for wastewater samples with initial concentrations of 40, 60, and 80 mg/L increased by 161.78%, 64.07%, and 35.51%, respectively, at 20 kGy, compared to that for the unirradiated samples. The ultraviolet spectrum analysis and infrared spectrum analysis results showed that the concentrations of aldehyde and ketone small molecule organics increased, and there were more biodegradable organic substances in the wastewater samples after irradiation. Microbial colony analysis revealed beneficial changes in the methanogenic archaea during the Anaerobic digestion (AD) process and increased the stability of the anaerobic fermentation system.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"190 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691175","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 : 2024-11-19DOI: 10.1016/j.radphyschem.2024.112407
C. Ferrer, C. Huertas, J. Isasi, P. Arévalo, M. Alcolea, M. Sáez
Focusing on the study of superparamagnetic iron oxide samples for applications as contrast agents, the potential utility of NiFe2O4@SiO2 sample as a contrast agent in image guided adapted brachytherapy (IGABT) treatments is described here. This magnetic sample was prepared by controlled hydrothermal synthesis with urea addition and further TEOS reaction using the Stöber method. X-ray patterns show diffraction maxima indexed to a cubic symmetry of S. G. Fd-3m with Z = 8, compatible with an inverse spinel-type structure. Polyhedral shape particles with a size of about 21 ± 5 nm, together with a homogeneous silica coating of 12.7 ± 1 nm thickness were observed in TEM images Catheters and plastic needles containing NiFe2O4@SiO2 sample in agarose solution mixture were investigated. Images obtained by magnetic resonance imaging (MRI), computed tomography (CT) and X-ray of the ovoid applicator containing NiFe2O4@SiO2 sample in agarose solution mixture, suggest that this sample may be useful for visualizing the source path by performing a T2 weighted MRI and without the need to acquire a CT image. This process reduces uncertainties due to patient movements between imaging modalities as well as procedure time. MRI and CT images of the interstitial needles filled with this solution at different concentrations confirm that it is also suitable for use as a contrast agent. Finally, the investigated sample-agarose mixture was also inserted into a block of human-like pork tissue to approximate an “in vivo” experimentation. The results suggest that the studied sample may be useful in IGABT treatments and intraoperative BT where a series of catheters are implanted into the surgical cavity. Currently, the contrast agents used are not visible inside plastic needles. Our study shows that no toxicity is introduced into the system since the sample is contained within plastic catheters and never encounters the tissue.
本文重点研究了用作造影剂的超顺磁性氧化铁样品，介绍了 NiFe2O4@SiO2 样品作为造影剂在图像引导适应性近距离放射治疗（IGABT）中的潜在用途。这种磁性样品是通过控制水热合成法制备的，其中添加了尿素，并使用斯托伯法进一步进行了 TEOS 反应。X 射线图显示，衍射最大值为 S. G. Fd-3m 的立方对称性，Z = 8，与反尖晶石型结构相匹配。在 TEM 图像中可以观察到大小约为 21 ± 5 nm 的多面体颗粒，以及厚度为 12.7 ± 1 nm 的均匀二氧化硅涂层，并对琼脂糖溶液混合物中含有 NiFe2O4@SiO2 样品的导管和塑料针头进行了研究。通过磁共振成像 (MRI)、计算机断层扫描 (CT) 和 X 射线获得的琼脂糖溶液混合物中含有 NiFe2O4@SiO2 样品的卵形涂抹器图像表明，这种样品可用于通过执行 T2 加权磁共振成像来观察放射源路径，而无需获取 CT 图像。这一过程减少了患者在不同成像模式之间移动所造成的不确定性，同时也缩短了手术时间。用不同浓度的这种溶液填充间隙针的核磁共振成像和 CT 图像证实，它也适合用作造影剂。最后，还将所研究的样本--琼脂糖混合物植入一块类人猪肉组织中，以进行近似 "体内 "实验。研究结果表明，所研究的样品可用于 IGABT 治疗和术中 BT（将一系列导管植入手术腔）。目前，所使用的造影剂在塑料针头内是不可见的。我们的研究表明，由于样本包含在塑料导管中，从未接触到组织，因此不会对系统造成毒性。
{"title":"NiFe2O4@SiO2 superparamagnetic nanoparticles as contrast agents in image-guided adaptive brachytherapy (IGABT)","authors":"C. Ferrer, C. Huertas, J. Isasi, P. Arévalo, M. Alcolea, M. Sáez","doi":"10.1016/j.radphyschem.2024.112407","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112407","url":null,"abstract":"Focusing on the study of superparamagnetic iron oxide samples for applications as contrast agents, the potential utility of NiFe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>@SiO<ce:inf loc=\"post\">2</ce:inf> sample as a contrast agent in image guided adapted brachytherapy (IGABT) treatments is described here. This magnetic sample was prepared by controlled hydrothermal synthesis with urea addition and further TEOS reaction using the Stöber method. X-ray patterns show diffraction maxima indexed to a cubic symmetry of S. G. Fd-3m with Z = 8, compatible with an inverse spinel-type structure. Polyhedral shape particles with a size of about 21 ± 5 nm, together with a homogeneous silica coating of 12.7 ± 1 nm thickness were observed in TEM images Catheters and plastic needles containing NiFe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>@SiO<ce:inf loc=\"post\">2</ce:inf> sample in agarose solution mixture were investigated. Images obtained by magnetic resonance imaging (MRI), computed tomography (CT) and X-ray of the ovoid applicator containing NiFe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>@SiO<ce:inf loc=\"post\">2</ce:inf> sample in agarose solution mixture, suggest that this sample may be useful for visualizing the source path by performing a T2 weighted MRI and without the need to acquire a CT image. This process reduces uncertainties due to patient movements between imaging modalities as well as procedure time. MRI and CT images of the interstitial needles filled with this solution at different concentrations confirm that it is also suitable for use as a contrast agent. Finally, the investigated sample-agarose mixture was also inserted into a block of human-like pork tissue to approximate an “in vivo” experimentation. The results suggest that the studied sample may be useful in IGABT treatments and intraoperative BT where a series of catheters are implanted into the surgical cavity. Currently, the contrast agents used are not visible inside plastic needles. Our study shows that no toxicity is introduced into the system since the sample is contained within plastic catheters and never encounters the tissue.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"190 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691160","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 : 2024-11-19DOI: 10.1016/j.radphyschem.2024.112412
Tooba Rafiq, Bushra Shaheen, Muhammad Hassan, Ateeque Ur-Rehman, Muhammad Naeem Anjum
Gamma irradiation alters the structural, morphological, and magnetic properties of Chitosan-coated Ytterbium-doped MnCo spinel ferrites. These findings hold significant potential for applications in diverse fields, including advanced materials science and electronics.
{"title":"Chitosan coated Yb-doped MnCo ferrite: Tailoring properties via gamma irradiation for contrast agents and sensors","authors":"Tooba Rafiq, Bushra Shaheen, Muhammad Hassan, Ateeque Ur-Rehman, Muhammad Naeem Anjum","doi":"10.1016/j.radphyschem.2024.112412","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112412","url":null,"abstract":"Gamma irradiation alters the structural, morphological, and magnetic properties of Chitosan-coated Ytterbium-doped MnCo spinel ferrites. These findings hold significant potential for applications in diverse fields, including advanced materials science and electronics.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"129 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691154","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}
Radiation therapy is increasingly becoming more targeted in how the doses are delivered. Online MR imaging, when combined with particle therapy such as proton or carbon ion therapy will offer a novel and exciting opportunity for radiotherapy. Integration of radiotherapy with MR imaging for carbon ion therapy is an active area of research, but its clinical implementation is still a way off. It is known that the employment of extremely high magnetic fields in particle therapy poses several challenges, in particular those related to treatment planning, workflow, dose delivery, and dosimetry.
{"title":"The impact assessment of a magnetic field dedicated to MRI during a carbon-therapy on treatment efficiency: Application to 1.5 T magnetic field","authors":"Ayoub Marhou, Abdelkarim Bazza, Ikram Habib-Allah, Mohammed Hamal, Mustapha Zerfaoui, Noureddine Chafi","doi":"10.1016/j.radphyschem.2024.112360","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112360","url":null,"abstract":"Radiation therapy is increasingly becoming more targeted in how the doses are delivered. Online MR imaging, when combined with particle therapy such as proton or carbon ion therapy will offer a novel and exciting opportunity for radiotherapy. Integration of radiotherapy with MR imaging for carbon ion therapy is an active area of research, but its clinical implementation is still a way off. It is known that the employment of extremely high magnetic fields in particle therapy poses several challenges, in particular those related to treatment planning, workflow, dose delivery, and dosimetry.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"24 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691156","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 : 2024-11-17DOI: 10.1016/j.radphyschem.2024.112403
Gaurav Trivedi, Pushpendra P. Singh, Arun S. Oinam
This study aimed to find the thermal and humidity-dependent behavior of EBT3 film. The changes in the film sensitivity as well as the dosimetric region of interest in the small-size film due to its storage and setup condition were evaluated.
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Pub Date : 2024-11-16DOI: 10.1016/j.radphyschem.2024.112404
M. Orabi
Enhancing the radiation dosage when performing a radiation therapy is affected by the type of the enhancing agent and its concentration. The aim of this study is to assess these effects by analyzing the enhanced radiotherapy process with testing the inclusion of different elements and different concentrations. Considering broad ranges for these two affecting factors, with different radiation sources, has never been addressed in prior studies. Two models are used; a simulation one, and a mathematical one. The simulation is made by the Monte Carlo N-Particle version 5 code. The human part considered in this study is the head, and the dosage is evaluated before and after adding the enhancing agent. Radiation sources of Au-198 and Cs-137 are used. The simulation results are compared to the mathematical model. An agreement is found regarding the general features, but the simulated values are deemed more realistic. The results of the mathematical model show underestimation compared to the simulation results due to the model's simplicity by considering only photons. Differently, the simulation scheme includes both photons and electrons, and considers the secondary interactions as well as the back-scattering effects. For the radionuclide Au-198, and when using a concentration of 5 % for the enhancing agent with atomic number 92, the simulation result is higher than that of the mathematical model by about 7 %. The results also show that, in some cases, the atomic number of the enhancing agent is not the main factor to decide about the treatment plan. Moreover, depending on the treatment case, the current paper suggests that a combined-selection for the enhancing agent, its concentration and the radiation source has to be carefully made. The results of this study shed some more light on the general features of using enhanced radiotherapy.
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Pub Date : 2024-11-15DOI: 10.1016/j.radphyschem.2024.112401
Ugur Soykan, Yalcin Kalkan, Senol Kaya, Selcen Uzun Duran, Rıfkı Terzioglu, Sedat Cetin
Developing radiation shielding materials is a critical phenomenon for protecting people and the environment with the increment in usage of nuclear technology in today's world. With this sense, PbO/colemanite-filled rigid polyurethane foams were fabricated by one-shut free rise method, and their performances were investigated via the advanced characterization techniques such as ATR-FTIR, SEM-EDS, TGA as well as thermal conductivity, universal mechanical and radiation shielding tests. The characteristic properties of the samples were evaluated in detail depending on the variation in the filler contents. The ATR-FTIR analysis illustrated that RPUF matrices exhibited good compatibility with the fillers by forming the secondary chemical bonds. Furthermore, SEM analysis revealed that the samples with low PbO/colemanite fillers exhibited fairly uniform and regular cellular morphology with anisotropic elliptical apparition thanks to synergetic catalytic effect of the filler particles, whereas, at high content, some local distortions with slightly chaotic appearance were observed accompanied by viewing the little ruptures and bursts in cell face and collapsed in cell plateau borders. TGA measurement indicated that the inclusion of the fillers into RPUF got worse the samples with comparison of neat RPUF due to the reduction in crosslinking density of the foam. Remarkable improvement (about 25 %) was also obtained in thermal insulation performance at the foam composites containing the fillers due to highly augmentation in number of closed cells and presence of more immobile CO2 gas inside the cells. Furthermore, high inclusion of the fillers in RPUF matrix improved compressive strength of the foams by nearly 15 % by enhancing the bending moment and rigidity of RPUF matrices via contributing to the overall stress dispersion. According to linear and mass attenuation coefficients results, the foam composites displayed excellent X-ray radiation shielding performance with increasing of PbO/colemanite content thanks to the density increment and presence of the atoms with high atomic number. Furthermore, at low photon energy levels, better shielding against X-ray radiation was obtained, while vice versa at high energy levels.
随着当今世界核技术应用的增加，开发辐射屏蔽材料是保护人类和环境的关键所在。有鉴于此，研究人员采用一缩自由上升法制造了氧化铅/沸石填充硬质聚氨酯泡沫，并通过 ATR-FTIR、SEM-EDS、TGA 等先进表征技术以及热导率、通用机械和辐射屏蔽测试对其性能进行了研究。根据填料含量的变化，对样品的特性进行了详细评估。ATR-FTIR 分析表明，RPUF 基质与填料形成二次化学键，表现出良好的兼容性。此外，扫描电镜分析表明，由于填料颗粒的协同催化作用，低氧化铅/高岭土填料含量的样品表现出相当均匀和规则的细胞形态，呈各向异性的椭圆形。TGA 测量表明，与纯 RPUF 相比，在 RPUF 中加入填料会降低泡沫的交联密度，从而使样品的性能变差。由于闭孔数量大幅增加以及孔内存在更多不流动的二氧化碳气体，含有填料的泡沫复合材料的隔热性能也得到了显著改善（约 25%）。此外，在 RPUF 基质中大量添加填料可提高 RPUF 基质的弯矩和刚度，从而促进整体应力分散，使泡沫的抗压强度提高了近 15%。根据线性和质量衰减系数结果，随着氧化铅/高岭土含量的增加，泡沫复合材料显示出优异的 X 射线辐射屏蔽性能，这归功于密度的增加和高原子序数原子的存在。此外，在低光子能级下，对 X 射线辐射的屏蔽效果更好，反之亦然。
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