Radiation Physics and Chemistry最新文献

{"title":"Degradation of PIN diode characteristics owing to displacement damage from low-fluence neutron exposure","authors":"Vishal Srivaths ,&nbsp;I-Chun Cho ,&nbsp;Chien-Yu Lin ,&nbsp;Shen-Hao Lee ,&nbsp;Aamir Farooq ,&nbsp;Hawibam Thoithoi Singh ,&nbsp;Cher-Ming Tan ,&nbsp;Tsi-Chian Chao","doi":"10.1016/j.radphyschem.2025.112919","DOIUrl":"10.1016/j.radphyschem.2025.112919","url":null,"abstract":"<div><div>This study examines the degradation characteristics of BPW34 PIN diodes under low-fluence neutron irradiation, with a focus on displacement damage mechanisms affecting their performance. Using G4SEE simulations, the effects of neutron-induced nuclear interactions were analyzed, and non-ionizing energy loss (NIEL) calculations were validated against SR-NIEL (a web-based radiation damage calculator) values, confirming the accuracy of the G4SEE simulation. Experimental results are analyzed to show the significance of dark current and carrier lifetime of minority carriers due to displacement damage. A near-linear relationship between fluence and dark current change (ΔI) observed beyond 2 × 10⁸ p/cm² is observed. The rate at which the carrier lifetime of the semiconductor is degraded by irradiation known as carrier lifetime damage coefficient, is measured to be 5 × 10⁴ s/cm², supporting the displacement damage mechanism. Comparison of our findings with the previous reports on high fluence shows different behavior. These findings show the inability to extrapolate the high fluence degradation trend to the low fluence case, and the latter is usually encountered in practical environment, and underscores the necessity of a detail study of the impact of low fluence neutron irradiation on PIN diodes for their dosimetry applications. Here high fluence irradiation refers to fluence above 10¹² p/cm², and low fluence irradiation refer to fluence below 10⁹ p/cm².</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112919"},"PeriodicalIF":2.8,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066446","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}

{"title":"Investigation of attapulgite clays@biochars@nickel oxide as a sustainable nanocomposite with superior radiation shielding characteristics","authors":"Mohammad Sayed ,&nbsp;Elhassan A. Allam ,&nbsp;Mohamed E. Mahmoud ,&nbsp;Rehab M. El-Sharkawy ,&nbsp;K.A. Mahmoud ,&nbsp;Shaaban M. Shaaban ,&nbsp;R.A. Elsad ,&nbsp;Islam M. Nabil","doi":"10.1016/j.radphyschem.2025.112917","DOIUrl":"10.1016/j.radphyschem.2025.112917","url":null,"abstract":"<div><div>Toward the radiation shielding applications, this study produced and tested nanocomposite materials from the attapulgite clay, biochar, and nano-nickel combination at varied concentrations of X = 15.0 %, 30.0 %, and 45.0 %, for the abbreviation A₄₀B_XNi_(60-X). Fourier transform infrared (FT-IR), X-ray fluorescence (XRF), and Raman microscopy described pristine Attapulgite, biochar, and nano-nickel. In the photon energy range of 0.015: 15 MeV, their radiation shielding properties were determined using Monte-Carlo simulation code (MCNP) and Phy-X web software. Both of biochar, and nano-nickel increases the gamma and neutron radiation shielding in Attapulgite. The synthetic sample A₄₀B₁₅Ni₄₅ with significant nano-nickel doping has the maximum linear attenuation. On the other hand, the A₄₀B₁₅Ni₄₅ Nano nanocomposite which contain the high content of biochar, was found the highest against the fast neutrons. The synthesized A₄₀B_XNi_(60-X) nano-composites presents the best gamma and fast neutron radiation shielding capability to be used in the various radiation applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112917"},"PeriodicalIF":2.8,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946635","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}

{"title":"A registration algorithm-guided framework for more accurate adaptive radiotherapy segmentation","authors":"Xin Yang ,&nbsp;Shaobin Wang ,&nbsp;Yimeng Zhang ,&nbsp;Lu Bai ,&nbsp;Jiawei Du ,&nbsp;Wanjia Zheng ,&nbsp;Zhen Li ,&nbsp;Qing Guo ,&nbsp;Jinxing Lian ,&nbsp;Yuliang Zhu ,&nbsp;Qi Chen ,&nbsp;Zhiqiang Jia ,&nbsp;Xuwei Tian ,&nbsp;Sijuan Huang","doi":"10.1016/j.radphyschem.2025.112918","DOIUrl":"10.1016/j.radphyschem.2025.112918","url":null,"abstract":"<div><h3>Purpose</h3><div>Adaptive Radiotherapy (ART) adjusts treatment plans based on changes in the patient's anatomy as seen in re-planning Computed Tomography (CT) scans. The standard approach is to use alignment algorithms and segmentation models trained on planning CT scans, but these often do not yield good results on re-planning CTs. We propose a better segmentation framework that integrates prior anatomical information from planning CTs to enhance re-planning CT segmentation accuracy.</div></div><div><h3>Methods</h3><div>We propose a two-stage segmentation model that guides deep learning with image registration. This model has two main components: a registration algorithm and a deep learning segmentation model (use nnUNet framework). The registration algorithm calculates how to align planning CTs with re-planning CTs to create a consistent spatial map. Then, the adjusted planning CTs and their segmentations are fed into the deep learning model to help it segment the re-planning CTs more accurately. We've gathered 82 sets of CT data for this project, using 68 for training our model and 14 for testing its performance.</div></div><div><h3>Results</h3><div>The framework achieved more accurate segmentation on re-planning CTs, with an average Dice similarity coefficient (DSC) of 70.7 % across 20 OARs. This is higher than the DL model and registration alone by 4.9 % and 5.1 %, respectively. The mean DSC of the nnUNet trained on planning CTs for segmenting re-planning CTs was 62.5 %, significantly lower than that of its segmentation of planning CT (72.9 %). <strong>Conclusions</strong>: The framework significantly enhances the segmentation accuracy of re-planning CTs by integrating patient-specific prior information from planning CTs through guided registration within a population-based DL segmentation model. It has considerable potential to improve the clinical outcomes of radiation therapy plans.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112918"},"PeriodicalIF":2.8,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066396","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}

{"title":"Assessment of proton shielding properties of rare earth metal-concrete using PHITS Monte Carlo code","authors":"Sitti Yani, Trio Sellin Nur Kholis, Duong Thanh Tai, Nissren Tamam, Abdelmoneim Sulieman, Tony Sumaryada, Akhiruddin, Setyanto Tri Wahyudi, Idam Arif","doi":"10.1016/j.radphyschem.2025.112908","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112908","url":null,"abstract":"This study evaluates the proton shielding performance of concrete modified with rare earth metals (REMs) using the Particle and Heavy Ion Transport code System (PHITS) Monte Carlo simulations. Standard concrete was doped with cerium, lanthanum, neodymium, and yttrium at 2 %, 5 %, and 10 % weight percentages. Proton energies of 50 and 100 MeV/u and shielding thicknesses of 5, 15, and 30 cm were analyzed to assess particle flux, including primary protons and secondary particles (neutrons, photons, electrons). Results show that REM-doped concrete effectively attenuates protons, with 10 % neodymium-doped concrete exhibiting the lowest flux of both primary and secondary particles. Increased REM concentration and thickness enhance shielding, though secondary particle production requires additional consideration. Neodymium-enriched concrete, particularly at 10 % concentration, is a promising material for compact shielding in proton therapy facilities, supporting the use of locally sourced REMs.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"125 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066448","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}

{"title":"Enhanced depolarization energy release in gamma-irradiated LDPE/ZIF-8 composite via increased charge trapping","authors":"Jelena Pajović ,&nbsp;Blanka Škipina ,&nbsp;Еrnst H.G. Langner ,&nbsp;Julia P. Mofokeng ,&nbsp;Edin Suljovrujić ,&nbsp;Vladimir Djoković ,&nbsp;Duško Dudić","doi":"10.1016/j.radphyschem.2025.112895","DOIUrl":"10.1016/j.radphyschem.2025.112895","url":null,"abstract":"<div><div>The charging of dielectric materials such as polymers results in relatively low energy densities compared to conventional electrochemical batteries. However, dielectric-based systems are less prone to chemical aging and more stable at elevated temperatures, making them suitable for applications requiring long-term stability. In this study, we demonstrate that low-density polyethylene (LDPE) can be modified to enhance the energy contribution of detrapping currents during depolarization, resulting in energy releases that exceed those of an ideal capacitor under identical electrostatic conditions. LDPE was combined with zeolitic imidazolate framework-8 (ZIF-8) filler and subsequently exposed to gamma irradiation to improve electrical conductivity and create additional charge-trapping sites. As-prepared and irradiated LDPE and LDPE/ZIF-8 composite thin films were charged in a weak DC field (∼6 V/mm). During charging, one side of the film was in direct contact with the negative electrode, while the opposite side was separated from the positive electrode by an air gap. Depolarization measurements were performed using the same setup. The study examines the effects of filler addition and/or irradiation doses on the accumulated charge and the energy released from LDPE. A key finding is that gamma irradiation of the LDPE/ZIF-8 composite significantly enhances the contribution of detrapping currents to the overall energy release during depolarization. For the 300 kGy-irradiated LDPE/ZIF-8 composite, detrapping currents account for approximately 30 % of the total energy released.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112895"},"PeriodicalIF":2.8,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143946634","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}

{"title":"Assessment of external radiation exposure dose rates and protective strategies following I-125 permanent prostate implantation treatment","authors":"Ho-Da Chuang ,&nbsp;Yu-Hung Lin ,&nbsp;Chin-Hsiung Lin ,&nbsp;Chen-Ju Feng ,&nbsp;Chen-Shou Chui ,&nbsp;Chin-Hui Wu ,&nbsp;Shih-Ming Hsu","doi":"10.1016/j.radphyschem.2025.112920","DOIUrl":"10.1016/j.radphyschem.2025.112920","url":null,"abstract":"<div><div>Iodine-125 (¹²⁵I) permanent prostate implantation, also known as brachytherapy, is a widely used treatment for localized prostate cancer. This procedure involves implanting radioactive ¹²⁵I seeds directly into the prostate gland, delivering targeted radiation to the tumor. A critical aspect of this therapy is assessing external radiation exposure to ensure safety for patients, healthcare workers, and the public. This study evaluated external radiation exposure from permanent prostate implantation therapy using direct measurements and Monte Carlo N-Particle (MCNP5) code simulations, specifically assessing the accuracy of simulated predictions against measured external radiation dose rates. The study included 21 patients with stage T1–T2a prostate cancer, treated between May 2013 and February 2016, who received ¹²⁵I implants through the perineum. External dose rates were measured in five directions at three distances from the patients' bodies. MCNP5 simulations based on post-treatment computed tomography (CT) images were compared with the measured dose rates. The results demonstrated a strong correlation (Spearman rank correlation coefficient &gt;0.7892) between measured external radiation and the patients' water equivalent thickness (WET) derived from CT images. No statistically significant differences were observed between the measured and simulated dose rates at 30 cm (<em>p</em> &gt; 0.05). The effective dose for the public and relatives remained within the limits set by the International Commission on Radiological Protection; however, caution is advised for children and pregnant women. In conclusion, this study established a reliable method for analyzing radiation dose rates using MCNP5 simulations to evaluate radiation safety following ¹²⁵I implantation. The precautionary times derived from Monte Carlo simulations can guide patient-specific radiation protection measures for close contacts. This approach provides valuable strategies to ensure radiation safety for medical staff, patients, and their families.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112920"},"PeriodicalIF":2.8,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066447","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}

{"title":"The preparation of a robust pyrazolate-based metal-organic framework by γ-irradiation for efficient uranium adsorption","authors":"Jinfeng Li ,&nbsp;Nan Zhang ,&nbsp;Qianwen Wang ,&nbsp;Jianwei Zhang ,&nbsp;Bo Tian ,&nbsp;Zhigang Li ,&nbsp;Haifeng Gu ,&nbsp;Hongtao Zhao","doi":"10.1016/j.radphyschem.2025.112915","DOIUrl":"10.1016/j.radphyschem.2025.112915","url":null,"abstract":"<div><div>The research for highly removal of uranium from nuclear waste is of significance for radionuclide remediation and environment. Herein, a robust pyrazolate-based metal-organic framework (NiBTP) is prepared by γ-irradiation through complexation between 1,3,5-tris(1H-pyrazol-4-yl) benzene (H₃BTP) and Nickel (II) and presents efficient U(VI) adsorption performance. The synthesized NiBTP is characterized by XRD, FTIR, SEM, TEM, XPS and N₂ adsorption/desorption isotherm analysis. Structural characterizations demonstrate that NiBTP prepared by γ-irradiation possesses decreased BET surface area with hierarchical pore structure, but also has excellent crystallinity and high chemical stability. Batch experiments reveal that NiBTP adsorbent displays high adsorption capacity of uranium and excellent selectivity for UO₂²⁺ ion in the presence of competing K⁺, Cs⁺, Sr⁺, Co²⁺, Mg²⁺, Ca²⁺, La³⁺ and Eu³⁺ ions. Thermodynamic investigation shows the adsorption process is endothermic and spontaneous. In addition, the adsorption mechanism of UO₂²⁺ ion onto NiBTP is attributed to the hierarchical pore architecture as well as complexation. This study presents a simpler and more efficient alternative method for the preparation of pyrazolate MOFs and highlights the power of robust pyrazolate MOFs in sequestrations of radioactive pollutants from water environment.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112915"},"PeriodicalIF":2.8,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066399","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}

{"title":"Dosimetric assessment of occupational exposure during percutaneous nephrolithotomy using Monte Carlo simulation","authors":"Evelyn L. Oliveira ,&nbsp;Monique F. Silva ,&nbsp;William S. Santos ,&nbsp;Lucio P. Neves ,&nbsp;Ana P. Perini","doi":"10.1016/j.radphyschem.2025.112914","DOIUrl":"10.1016/j.radphyschem.2025.112914","url":null,"abstract":"<div><div>This research focuses on estimating the radiation doses delivered to the main and assistant physicians during percutaneous nephrolithotomy (PCNL) via computer modeling. To achieve this, scenarios were simulated using the Monte Carlo <em>N</em>-Particle 6.2 code in a simulated PCNL procedure setting. The scenarios varied according to the anteroposterior (AP), right anterior oblique, 30° (RAO30) and left anterior oblique, 30° (LAO30) projections. Variations in body mass index (BMI) were modeled using two virtual anthropomorphic phantoms. These different phantoms were employed to study the influence of the BMI factor on the scattered radiation by the patient. The study also assessed the impact of personal protective equipment (PPE) and collective protective equipment (CPE) on reducing radiation doses for the main physician and assistant. The physician and assistant were simulated using a MASH3 virtual phantom. The Siemens SIREMOBIL Compact L fluoroscopic device was modeled, the tube voltage value for all scenarios was 70 kV, as well as the field size was 11 × 11 cm², and the experimental kerma-area product was equal to 27 Gy⋅cm². The effective doses obtained for the main physician ranged from 0.92 to 41.47 μSv. The use of PPE and CPE reduced the effective dose by 94 %. The equivalent doses found for the main physician's eyes varied in a range of 0.172–7.34 mSv, and the use of PPE and CPE resulted in a 98 % reduction in eye dose. The effective doses obtained for the assistant ranged from 0.33 to 13.49 μSv. In all simulated scenarios, the main physician receives an effective dose up to 71 % higher than the assistant. Our study found that oblique projections resulted in higher radiation exposure for the main physician, with the LAO30 projection increasing the dose by 51 % compared to the AP projection.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112914"},"PeriodicalIF":2.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936258","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}

{"title":"Impact of radiobiological parameters on tumor control probability in rectal cancer using the Poisson linear quadratic model","authors":"Duong Thanh Tai, Nguyen Ngoc Anh, Luong Tien Phat, Tran Trung Kien, Nguyen Xuan Hai, Nguyen Huu Tiep, Peter Sandwall, Hiba Omer, Abdelmoneim Sulieman, Nissren Tamam, James C.L. Chow","doi":"10.1016/j.radphyschem.2025.112902","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112902","url":null,"abstract":"We explore several radiobiological parameters, specifically the tissue-specific linear quadratic α/β, the maximum normalized gradient of dose response γ, and the dose giving a 50 % response probability for the tissue considered D<ce:inf loc=\"post\">50</ce:inf>, looking at how these affect the computed Tumor Control Probabilities (TCPs) within the Poisson Linear Quadratic (LQ) model. A total of 3,584,000 TCP values were derived for 28 rectal cancer patients, utilizing two slightly different treatment plans: the short plan (50 Gy in 25 fractions) and the long plan (50.4 Gy in 28 fractions), along with 64,000 parameter combinations. TCP was calculated using the Poisson LQ model, which combines radiobiological parameters (α/β, γ, and D<ce:inf loc=\"post\">50</ce:inf>) with the voxel-based Equivalent Dose (EQD). Our analysis reveals that D<ce:inf loc=\"post\">50</ce:inf> has the most significant influence, followed by γ, while α/β has minimal impact. Moreover, the influence of γ depends on the specific D<ce:inf loc=\"post\">50</ce:inf> value employed. Furthermore, comparing TCPs obtained for short and long plans, these consistently show the TCP of the short plan to surpass that of the long plan when the same radiobiological parameter values are used. This study suggests that evaluating treatment plan efficacy through TCPs it is appropriate to use consistent parameter values within the Poisson Linear Quadratic model.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"14 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066449","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}

{"title":"Evaluating PET and PEN under gamma irradiation: insights into material stability","authors":"N. Belkahla ,&nbsp;G. Teyssedre ,&nbsp;N. Saidi-Amroun ,&nbsp;S. Mouaci ,&nbsp;M. Saidi","doi":"10.1016/j.radphyschem.2025.112912","DOIUrl":"10.1016/j.radphyschem.2025.112912","url":null,"abstract":"<div><div>Thermoplastic polyesters such as Poly(ethylene terephthalate) –PET- and Poly(ethylene naphthalate) –PEN- are commonly used as capacitors but can find other high-end applications such as scintillators. The resistance of such materials to ageing under thermal, hydrolytic or UV ageing has often been compared notably from the standpoint of physicochemical and optical properties. PEN in general has better performance in resisting to stresses. The purpose of this work is to evaluate and compare the resistance of the materials to ionizing radiation. Films of both materials were subjected to gamma-ray irradiation at several doses in an air environment. Electrical properties were probed by DC conductivity measurements at electric fields of up to 200 kV/mm. Photo-physical properties were investigated by Infrared spectroscopy, UV–visible transmission spectroscopy and photoluminescence experiments. While PEN shows only moderate changes with the irradiation dose, PET evolves substantially, with an absorption band in the region 310–360 nm going with a reduction of the optical band gap, and a strong fluorescence emission appearing at 368 nm. The behaviour has been interpreted as arising mainly from chain scission along the Norrish type mechanisms and the subsequent production of hydroxylated benzoic acids. The high field conductivity of both materials is impacted by irradiation and the behavior cannot easily be explained by chemical evolution alone.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"236 ","pages":"Article 112912"},"PeriodicalIF":2.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936264","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}