Radiation Physics and Chemistry最新文献

{"title":"New estimation of electron and photon internal dose coefficients for new adult female computational phantom using DoseCalcs","authors":"Tarik El Ghalbzouri ,&nbsp;Tarek El Bardouni ,&nbsp;Jaafar El Bakkali ,&nbsp;Mohamed Drissi El-Bouzaidi ,&nbsp;Hicham Satti","doi":"10.1016/j.radphyschem.2025.112705","DOIUrl":"10.1016/j.radphyschem.2025.112705","url":null,"abstract":"<div><div>Internal radiation dosimetry is critical in nuclear medicine procedures involving radiopharmaceuticals as it evaluates the risks and benefits of diagnostic and therapeutic applications. In this context, radiological protection quantities, including absorbed dose and effective dose, are derived from the specific absorbed fraction (SAF), a fundamental dose coefficient. The SAF quantifies the fraction of energy deposited in a target region per unit mass relative to the energy emitted from a specified source region.</div><div>Updating the SAF dataset using the latest mesh-type computational phantoms is strongly recommended. Comparing these values with SAFs from earlier voxel-based phantoms helps identify target<span><math><mo>←</mo></math></span>source combinations with variations in internal dosimetry coefficients, reflecting the anatomical improvements in mesh-type phantoms.</div><div>Simulations using the DoseCalcs platform were conducted for electron and photon transport at eight energies (10 keV to 2 MeV), employing the adult female mesh-type phantom from ICRP Publication 145. Subsequently, SAFs were calculated for twenty-four distinct source regions and compared with those derived by OpenDose using the voxel-based model.</div><div>The results showed that SAFs calculated with mesh-type and voxel-based phantoms are similar, with minor differences observed for both photons and electrons. Notable variations were observed for photons in the spleen<span><math><mo>←</mo></math></span>liver combination and for electrons at low energy, particularly in the pancreas<span><math><mo>←</mo></math></span>liver and liver<span><math><mo>←</mo></math></span>pancreas combinations. These differences highlight the impact of anatomical improvements in mesh-type phantoms. These differences arise from improved internal structures, particularly for adjacent organs/tissues, due to differences in contact surface geometry. The mesh-type model uses smooth surfaces, while the voxel-based model employs stair-based surfaces.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112705"},"PeriodicalIF":2.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734621","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":"Evaluation of the dosimetric influence of a pacemaker on breast cancer radiotherapy: A Monte Carlo study","authors":"Felipe B. Cruz ,&nbsp;Alessa Maschio ,&nbsp;Willliam S. Santos ,&nbsp;Ana P. Perini ,&nbsp;Lucio P. Neves","doi":"10.1016/j.radphyschem.2025.112763","DOIUrl":"10.1016/j.radphyschem.2025.112763","url":null,"abstract":"<div><h3>Background/introduction</h3><div>Population aging and unhealthy lifestyle habits increase the incidence of cancer and cardiovascular diseases, often necessitating the implantation of pacemakers, which are sensitive to radiation. 3D conformal radiotherapy is a common approach for treating breast cancer; however, absorbed doses above 2 Gy may cause pacemaker malfunctions.</div></div><div><h3>Purpose</h3><div>The aim of this study is to evaluate the influence of a pacemaker on breast cancer radiotherapy.</div></div><div><h3>Methods</h3><div>This study used the MCNP 6.3 particle transport code to simulate a 6 MV breast cancer radiotherapy in a LINAC Versa, modelling a pacemaker in Blender and implanting it in the female reference phantom from ICRP Publication 145.</div></div><div><h3>Results</h3><div>Analysing the organs adjacent to the treatment volume, results indicated that the heart and ipsilateral lung received an increase of 0.61 % and 0.66 % in absorbed dose, respectively, while the ipsilateral pacemaker absorbed 23.49 Gy for a prescribed breast dose of 50 Gy. When using MLC-based shielding, the pacemaker dose decreased to 1.15 Gy, with a 18.89 % reduction in breast dose. Relocating the pacemaker to the contralateral breast further reduced its dose to 0.44 Gy. No significant differences were observed in local dose distribution with the pacemaker.</div></div><div><h3>Conclusion</h3><div>Pacemaker relocation and MLC-based shielding are effective strategies to reduce the dose absorbed by the device.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112763"},"PeriodicalIF":2.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768912","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 analysis of beam number variations in IMRT for head-and-neck, breast, and pelvic cancers using Halcyon","authors":"Luong Tien Phat, Mai Thi Thao, Tran Trung Kien, Duong Thanh Tai, Peter Sandwall, Abdelmoneim Sulieman, Nissren Tamam, Sitti Yani, James C.L. Chow","doi":"10.1016/j.radphyschem.2025.112755","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112755","url":null,"abstract":"This study investigated the dosimetric effects of varying beam numbers (9, 11, and 13) in intensity-modulated radiation therapy (IMRT) using the Halcyon linear accelerator at ShingMark University Hospital. IMRT plans for 27 patients with head-and-neck, breast, and pelvic cancers were evaluated according to the RTOG 0615 protocol, focusing on Planning Target Volume (PTV) dose coverage, uniformity, maximum and minimum doses, and Organ-at-Risk (OAR) dose constraints. For breast cancer, the 11-beam plan improved PTV coverage (V50Gy: 97.9 ± 0.5 %) and reduced maximum dose compared to 9- and 13-beam plans, while the 13-beam plan lowered heart mean dose by up to 10.5 % in left breast cases. In pelvic cases, the 13-beam plan enhanced OAR sparing, reducing bowel V35Gy by 10.5 % compared to the 9-beam plan, with minimal PTV coverage differences (&lt;0.2 %). For head-and-neck cancer, the 13-beam plan improved PTV D95 % and spared critical structures like the brainstem, though it increased doses to the chiasm and cochlea. Treatment time and Monitor Units rose with more beams, particularly for head-and-neck and pelvic cases, but remained minimal for breast cases. These findings suggest tailoring beam numbers to cancer type and clinical priorities, balancing dosimetric benefits with treatment efficiency.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"11 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143744804","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":"Radiometric and simulation analysis with MCNP 6.3 of products that expose the skin by absorption","authors":"Leandro Barbosa da Silva ,&nbsp;Lucas Faria da Silva ,&nbsp;Alexander Camargo Firmino da Silva ,&nbsp;Carlos Omar Pastrana Orejuela ,&nbsp;Jonathan Oliveira dos Santos ,&nbsp;Nancy Baygorrea Cusihuallpa ,&nbsp;Jardel Lemos Thalhofer ,&nbsp;Ademir Xavier da Silva","doi":"10.1016/j.radphyschem.2025.112756","DOIUrl":"10.1016/j.radphyschem.2025.112756","url":null,"abstract":"<div><div>This study focuses on the evaluation of the natural radioactivity levels of ²²⁶Ra, ²³²Th, and ⁴⁰K in 51 samples of various types of cleaning materials, cosmetics, and daily care products that are available in the markets of the State of Rio de Janeiro (Brazil). The specific activities, the radium equivalent concentration, and the annual effective doses to the skin were determined using the gamma spectroscopy method and a High Purity Germanium detector. Using the Monte Carlo method (MCNP 6.3), the cosmetic Henna radioactive products were simulated with the reference phantom, and the organ doses were calculated with the usage scenario. The mean values of activity concentrations were 4.49 ± 1.25, 3.82 ± 0.44, 38.75 ± 8.70, and 12.94 ± 2.56 Bq kg⁻¹ for ²²⁶Ra, ²³²Th, ⁴⁰K, and Ra_eq, respectively. Meanwhile, the effective skin dose ranged from (0.74 ± 0.16 to 94.2 ± 24.9) μSv y⁻¹, with an average value of 7.49 ± 1.39 μSv y⁻¹, below the limit value of 1 mSv y⁻¹. The average annual effective skin dose values simulated by MCNP 6.3 for the arm and head regions exposed to the Henna cosmetic were 1.1 ± 0.1 and 1.9 ± 0.2 μSv y⁻¹, respectively. However, the value found in this present work was 2.0 ± 0.1 μSv y⁻¹, a percentage difference of 5.26 %. According to the regulation in CNEN 3.01 NN of 2024, the results indicated that the products studied do not significantly harm consumers' health in a radiological sense.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112756"},"PeriodicalIF":2.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747817","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":"Electron accelerator driven subcritical system loaded with spent nuclear fuel","authors":"Bin Liu,&nbsp;Xiangwen Guo,&nbsp;Xinying Zhang,&nbsp;Tianfang Liu,&nbsp;Xuefeng Lyu,&nbsp;Fang Liu,&nbsp;Ran Han","doi":"10.1016/j.radphyschem.2025.112753","DOIUrl":"10.1016/j.radphyschem.2025.112753","url":null,"abstract":"<div><div>We study an electron accelerator driven subcritical system (eADS) to burn the spent nuclear fuel, the eADS core is similar to a typical pressurized water reactor (PWR). The physical mechanism to produce neutrons by electron beams in eADS is different to the spallation neutron source used in the proton accelerator driven ADS system.</div><div>Loading spent nuclear fuel to eADS core save considerable amount of enriched nuclear fuel, but loading spent nuclear fuel leads to the uneven neutron flux distribution and the excessive high power peaking factors which is adverse to the safe operation of eADS reactor. After rearranging the spent fuel loading pattern in the subsequent fuel cycle, calculation results indicate that eADS only needs 2.4 % enrichment fuel assemblies to be loaded to its periphery area, rest of 2/3 core area charged with spent nuclear fuel can flatten the neutron flux and reduce power peaking factors ideally.</div><div>eADS saves considerable amount of expensive enriched nuclear fuel and operate in much safer subcritical operation condition, eADS also eliminates the control rod requirement which is necessary in a typical PWRs to control the nuclear fission reactions. eADS is promising to burn spent nuclear fuel and generate electric power simultaneously.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112753"},"PeriodicalIF":2.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705137","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":"New developments in monochromatic energy dispersive X-ray fluorescence instrumentation for monitoring toxic elements in food matrices: Advantages and limitations","authors":"Boris Johnson-Restrepo ,&nbsp;Ezekiel Blain ,&nbsp;Christopher Judd ,&nbsp;Andrew Tysoe ,&nbsp;Patrick J. Parsons","doi":"10.1016/j.radphyschem.2025.112749","DOIUrl":"10.1016/j.radphyschem.2025.112749","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Monochromatic excitation (M-) based on a low-power X-ray (20–50W) source with doubly curved crystal (DCC) optics has been used successfully for X-ray fluorescence (XRF) analysis of many different sample matrices. Previously, a “first-generation” M-XRF analyzer, the HD Mobile® (X-ray Optical Systems, (XOS) East Greenbush NY), was used in a field-based public health study. The HD Mobile® was optimized to detect Pb, Cd, Hg and As in consumer products, food, and cultural medications, with limits of detection (LOD) on the order of a single digit μg/g (ppm) mass fraction. In this current study, two “second generation” DCC-enabled XRF analyzers were evaluated for detecting key toxic elements in food matrices. The two instruments evaluated included: the Zmax™ XRF Analyzer and the Emax™ Analyzer, which are both manufactured by Z-Spec (East Greenbush, NY, US). The Zmax™ uses an X-ray tube operated at 35W with a single DCC optic for a 17.5-keV excitation beam optimized to detect Pb, As, Hg, Ni and Cr. A fast silicon drift detector (SDD) is used to detect fluorescence x-rays. The Emax™ uses an X-ray tube operated at 40 W with DCC optics for a 30-keV excitation beam, and a thicker 1-mm SDD optimized to detect Cd, Mo, Sb, and Sn, along with many other elements. While the primary focus of the current study was the Emax™ and Zmax™, several other XRF analyzers were available and were included for comparison purposes. They included the HD Mobile® (XOS), and two ‘conventional’ portable XRF analyzers: the Niton™ XL3t GOLDD XRF, and the Niton™ XL5 Plus, both manufactured by ThermoFisher Scientific (Tewksbury, MA). Z-Spec used certified reference materials (CRMs) to optimize the Fundamental Parameters algorithm for the Zmax™ and Emax™ analyzers to achieve acceptable performance for key toxic elements in biological matrices. For the Zmax™, difference plots show good agreement between found values and CRM assigned values for the elements studied (Pb, As, Cu, Mn, Ni, Hg and Zn). For the Emax™, there was good agreement for values obtained for Cd in CRMs. Archived food-based proficiency test (PT) samples were analyzed to assess the performance of the Zmax™ and Emax™ as screening tools to detect key elements. Some of the PT samples were also analyzed using the two Niton™ XRF instruments as well as the HD Mobile® for comparison purposes. These PT samples were spiked with toxic elements and circulated by the FDA to US-based public health laboratories funded under the Food Emergency Response Network (FERN), with target values assigned based on consensus data obtained from analyses based on Inductively Coupled Plasma Mass Spectrometry (ICP-MS). For the FERN 2022 PT samples (sausage meat), which were spiked with Tl, Cd and Pb, Zmax™ values were within the tolerance range required for ICP-MS analysis. Estimated LODs in μg/g (ppm) were: Pb, 0.06; Tl, 0.06; Hg, 0.06; Cd, 0.04; and Sn, 0.11. Several ‘real-world’ samples were analyzed using the Zmax™ and Emax™ devices, incl","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112749"},"PeriodicalIF":2.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792085","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":"Feasibility study on the possibility of utilizing e-nut shell ashes for gamma-radiation protection application","authors":"U. Rilwan ,&nbsp;M.A. Abdulazeez ,&nbsp;I. Maina ,&nbsp;O.W. Olasoji ,&nbsp;A. El-Taher ,&nbsp;A.U. Maisalatee ,&nbsp;M.U. Sarki ,&nbsp;G. Mohammed ,&nbsp;M.I. Sayyed","doi":"10.1016/j.radphyschem.2025.112748","DOIUrl":"10.1016/j.radphyschem.2025.112748","url":null,"abstract":"<div><div>This study explored the gamma-ray shielding performance of various fruit-nut shells and husk ashes like cashew-nut shell ash (CSNSA), coconut shell ash (CCNSA), palm-kernel-nut shell ash (PKNSA), melon-husk ash (MHA), rice-husk ash (RHA), peanut shell ash (PNSA), and deleb-palm-nut shell ash (DPNSA) within the energy range of 0.015–0.284 MeV. The samples were gathered, washed, dried at room temperature, and burnt to ashes at 200 ^°C for 30 min using a muffle furnace. The ashes' densities were calculated as mass/volumes of the samples. The samples were analyzed for oxide composition using an energy dispersive X-ray fluorescence analyzer (ARL-QUANT'X-EDXRF) with 1–2 % uncertainty and 40 keV resolution. The oxide compositions and densities were inputted in Phy-X/PSD to obtain the gamma-ray shielding parameters. The results showed that sample CCNSA at the energy of 0.015 MeV displayed the highest MAC value of 2001.23 cm²/g and LAC value of 6100.99 cm⁻¹, representing high shielding performance, while sample RHA exhibited the least MAC and LAC values, confirming its low shielding performance. This indicated that, among all the examined samples, CCNSA is characterized with the superior shielding features. Therefore, researchers are encouraged to incorporate CCNSA into either concrete or glass samples and to test its effect on their shielding performance in order to improve achievement of the Sustainable Development Goals.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112748"},"PeriodicalIF":2.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686349","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":"XRF and gamma-ray data fusion for predicting key soil fertility attributes","authors":"José Vinícius Ribeiro ,&nbsp;João Marcos Fávaro Lopes ,&nbsp;Avacir C. Andrello ,&nbsp;Jose Francirlei de Oliveira ,&nbsp;Graziela M.C. Barbosa ,&nbsp;Rodrigo O. Bastos ,&nbsp;Fábio Luiz Melquiades","doi":"10.1016/j.radphyschem.2025.112750","DOIUrl":"10.1016/j.radphyschem.2025.112750","url":null,"abstract":"<div><div>Efforts to address the limitations of traditional wet chemistry methods have driven studies combining proximal soil sensors with machine learning (ML) to assess soil health through fertility attributes. While energy dispersive X-ray fluorescence (XRF) has been widely and successfully applied, gamma-ray spectrometry (GR) remains relatively underexplored. At the same time, XRF and GR integration (XRF + GR) by data fusion techniques represent a promising pathway to increase the reliability of predictive results. From this perspective, this study aimed to address scientific gaps on deepening data fusion approaches, applying more complex ML algorithms beyond traditional linear regression methods, and expanding findings to encompass a broader set of fertility attributes. Specifically, we compared the standalone performance of XRF vs. XRF + GR by low- and high-level data fusion strategies employing Random Forest (RF), Partial Least Squares (PLS), and Artificial Neural Networks (ANN-MLP) models for assessing soil organic carbon (SOC), cation exchange capacity (CEC), plant-available Magnesium (avMg), Potassium (avK), and Calcium (avCa). A Rhodic Ferrasol soil dataset (<em>n=</em>80) was exploited. Although RF achieved the highest predictive performance compared to PLS and ANN-MLP (0.45 ≤ R² ≤ 0.78, 1.29 ≤ RPIQ ≤2.68) on XRF data, they were outperformed by data fusion approaches for most attributes, as the relative improvement indicated enhancements for SOC (12.3 %), CEC (20.2 %), and avCa (20.9 %) modeling. While low-level fusion models attained excellent results for SOC (R² = 0.83, RPIQ = 3.05) and avCa (R² = 0.82, RPIQ = 3.19), high-level fusion excelled in CEC prediction (R² = 0.70, and RPIQ = 2.83). The standalone XRF approach proved sufficient for avK modeling (R² = 0.71, and RPIQ = 2.52), however, avMg prediction remained challenging across all methods. Overall, the XRF + GR synergy enhanced the predictive accuracy of most evaluated soil parameters (SOC, CEC, and avCa), providing valuable insights for developing more efficient, precise, and sustainable soil monitoring methodologies at local scale.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112750"},"PeriodicalIF":2.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714539","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":"Detection efficiency and imaging performance of a 25.4 × 25.4 × 24 mm3 compton camera based on a single voxelized scintillator","authors":"Seonghee Choi ,&nbsp;Hyounggun Lee ,&nbsp;Wonho Lee","doi":"10.1016/j.radphyschem.2025.112754","DOIUrl":"10.1016/j.radphyschem.2025.112754","url":null,"abstract":"<div><div>Conventional Compton cameras have FOV limitations that affect their detection efficiency. Three-dimensional voxelized detectors that integrate scattering and absorption functions address these limitations. This study demonstrates the enhancement of a Compton camera system by expanding the voxelized detector volume to increase its detection efficiency and reduce data acquisition time for reconstructing radiation sources. By doubling the size of a previous 4 × 4 × 4 voxel detector (12.6 × 12.6 × 12 mm³) to an 8 × 8 × 8 (25.4 × 25.4 × 24 mm³), both the angular resolution and signal-to-noise ratio were significantly improved. Simple back-projection and list-mode maximum likelihood estimation methods were used for image reconstruction, and the expanded system showed a significant decrease in measurement times by up to 20 times with equivalent image quality. This advancement is expected to provide substantial improvements in the deployment of lightweight and high-efficiency Compton cameras in unmanned measuring equipment, such as in drones, for various industrial applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112754"},"PeriodicalIF":2.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697718","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 structure, crystallinity, and irradiation modality on post-irradiation free radical evolution in PEs","authors":"E. Suljovrujic ,&nbsp;D. Milicevic ,&nbsp;D. Milivojevic ,&nbsp;D. Vasalic ,&nbsp;G. Stamboliev","doi":"10.1016/j.radphyschem.2025.112744","DOIUrl":"10.1016/j.radphyschem.2025.112744","url":null,"abstract":"<div><div>Polyethylene (PE) has many advantages as a polymeric material for biomedical applications, including single-use (SU) medical ones. Depending on the type of PE, its applications vary from single-use medical device packaging to implants for joint prostheses and custom-made artificial bones. The need to sterilize these products has led to more intensive use of different modalities of high-energy radiation (gamma, electron beam (EB), and X-ray) due to heat input limitations and EtO toxicity.</div><div>In this paper, we investigate the effects of gamma and electron beam (EB) radiation on various PE types (LDPE, LLDPE, HMWPE, UHMWPE, and HDPE), focusing on how the initial structure and crystallinity influence post-irradiation behavior and the evolution of long-lived free radicals. Long-lived free radicals were monitored for up to six months, with their evolution correlated to the initial structure and crystallinity. Chain scission, oxidative degradation, and decline in properties caused by long-lived free radicals can continue long after irradiation, significantly impacting performance during storage and even failure of medical devices during exploitation. This article establishes a good correlation between crystallinity and post-irradiation evolution of long-lived free radicals, with limited consideration of other structural features and the presence of additives.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112744"},"PeriodicalIF":2.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714540","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}