Radiation Physics and Chemistry最新文献

{"title":"Radiation Physics and Chemistry Special Issue on “Comparison on Radiation Effects on Products Sterilized Using Gamma-ray, E-beam, or X-ray Sources”","authors":"Emily Craven, Byron Lambert","doi":"10.1016/j.radphyschem.2025.113092","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.113092","url":null,"abstract":"","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"17 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335595","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":"Fragmentation of singly charged ions of leucine, norleucine, and methionine","authors":"A.A. Basalaev,&nbsp;K.V. Simon,&nbsp;O.V. Smirnov","doi":"10.1016/j.radphyschem.2025.113091","DOIUrl":"10.1016/j.radphyschem.2025.113091","url":null,"abstract":"<div><div>In this work, the mechanism for fragmentation of singly charged ions of leucine (Leu), norleucine (Nle) and methionine (Met) molecules in the gas phase was studied by means of the method of multi-configuration self-consistent field (MCSCF). Parameters of molecules and singly charged ions of these amino acids were calculated. The paper considers reaction paths of the main experimentally observed ion fragmentation channels. Calculations of the fragment appearance energies as a rule are in satisfactory agreement with the available experimental data. Analysis of reaction paths allowed us to determine the most probable resulting fragment ions in the case of ambiguous identification of experimental results.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113091"},"PeriodicalIF":2.8,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335554","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 Monte Carlo analysis of the feasibility of a 3D structure build up with silicon photodiodes for in vivo dosimetry in radiotherapy","authors":"J.A. de la Torre ,&nbsp;I. Ruiz-Garcia ,&nbsp;D. Guirado ,&nbsp;A.J. Palma ,&nbsp;M.A. Carvajal ,&nbsp;A.M. Lallena ,&nbsp;M. Anguiano","doi":"10.1016/j.radphyschem.2025.113012","DOIUrl":"10.1016/j.radphyschem.2025.113012","url":null,"abstract":"<div><h3>Purpose:</h3><div>This study investigates the capabilities of a novel 3D cube device comprising six BPW34S photodiodes (Vishay Semiconductors), one on each side, recently proposed for in vivo dosimetry.</div></div><div><h3>Methods:</h3><div>The study has been conducted by using the Monte Carlo simulation codes FLUKA-CERN, TOPAS and PENH. In the simulations, the 3D dosimeter has been situated on top of a water phantom and has been irradiated with a ⁶⁰Co beam and two clinical photon beams of <span><math><mrow><mn>6</mn><mspace></mspace></mrow></math></span>MV and <span><math><mrow><mn>15</mn><mspace></mspace></mrow></math></span>MV. The dependence of the detector response with the angle of incidence of the beam has been investigated. Simulations without the phantom have been done to study the effect of the backscattered radiation in the detector response. The effect of an encapsulation of the detector on the angular dependence ofits response has been also analyzed. In addition, the changes that the presence of the detector produces on the absorbed dose in the phantom have been studied.</div></div><div><h3>Results:</h3><div>Similar results have been obtained with the three Monte Carlo codes. The angular dependence of the 3D cube detector is reduced with respect to that found in case a single photodiode is used as dosimeter. The results of the simulations are in overall agreement with preliminary experimental data recently published. In the simulations carried out including the encapsulation, the angular dependence of the dosimeter response is significantly reduced. Finally, it has been found that the presence of the 3D detector produces a non-negligible increase of the absorbed dose at the phantom surface.</div></div><div><h3>Conclusions:</h3><div>The 3D cube detector constructed with six photodiodes, one in each of its faces, shows a significantly lower angular dependence in comparison to a single photodiode. The angular dependence can also be strongly reduced by embedding the dosimeter in an encapsulation with the appropriate thickness. The increasing of the absorbed dose at the surface must be considered because of the possible effects it could produce in the skin of patients in clinical applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113012"},"PeriodicalIF":2.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322492","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 new method for transit time error measurement of tele-cobalt and high dose rate (HDR) brachytherapy unit","authors":"Parsee Tomar ,&nbsp;Ranjit Singh ,&nbsp;Ngangom Robert ,&nbsp;Arun Oinam ,&nbsp;R. Kapoor ,&nbsp;J.S. Shahi","doi":"10.1016/j.radphyschem.2025.113074","DOIUrl":"10.1016/j.radphyschem.2025.113074","url":null,"abstract":"","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113074"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290470","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":"Design and optimization of polymer-doped perfect annular photonic crystal for gamma radiation sensing application","authors":"Hussein A. Elsayed ,&nbsp;Suryakanta Nayak ,&nbsp;Ayman A. Ameen ,&nbsp;Haifa E. Alfassam ,&nbsp;Ali Hajjiah ,&nbsp;Mostafa R. Abukhadra ,&nbsp;Stefano Bellucci ,&nbsp;Ahmed Mehaney","doi":"10.1016/j.radphyschem.2025.113075","DOIUrl":"10.1016/j.radphyschem.2025.113075","url":null,"abstract":"<div><div>This study presents a novel design for a polymer-doped annular photonic crystal (APC) tailored for high-sensitivity gamma-ray detection. The structure comprises 40 repeated bilayer unit cells arranged alternately. The first layer consists of porous silicon impregnated with polyvinyl alcohol (PVA) and doped with crystal violet (CV) and carbol fuchsine (CF) dyes, while the second layer contains PVA similarly doped with CV and CF. To evaluate the reflectance spectrum, a modified transfer matrix method was employed, emphasizing the distinctive optical behavior of photonic bandgaps (PBG) for accurate radiation measurement.</div><div>By optimizing the APC's geometrical parameters and incorporating polymer doping, we achieved enhanced tunability of the PBG in the reflectance spectrum. Exposure to varying doses of gamma radiation induced noticeable shifts in the PBG's left and right edge wavelengths, as well as alterations in its width and central position. Numerical simulations revealed a peak sensitivity of 232.59 nm/RIU for gamma-ray doses ranging from 0 Gy to 70 Gy. This innovative APC design offers a robust and efficient approach to real-time gamma-ray dosimetry, with promising potential in medical radiation monitoring, nuclear safety, and environmental protection.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113075"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297849","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":"Germanate oxide and oxyfluoride glasses doped with Dy3+ ions for white light emitting device applications","authors":"Rajaramakrishna R. ,&nbsp;Nikonorov N. ,&nbsp;Babkina A. ,&nbsp;Aleksandrova E. ,&nbsp;Gerasimova M. ,&nbsp;Slyusareva E. ,&nbsp;Vasiliev G. ,&nbsp;Abhiram J. ,&nbsp;Rudraprasad H.V. ,&nbsp;Sristiitpokakun N. ,&nbsp;Kirdsiri K. ,&nbsp;Kaewkhao J. ,&nbsp;Intachai N. ,&nbsp;Kothan S. ,&nbsp;Jayasankar C.K.","doi":"10.1016/j.radphyschem.2025.113054","DOIUrl":"10.1016/j.radphyschem.2025.113054","url":null,"abstract":"<div><div>The present study highlights the influence of Dy³⁺ ions on the luminescent properties of glass matrices, specifically focusing on the effects of oxide, oxyfluoride, and sensitizer content. The emission behaviour and characteristics of dysprosium in these different environments have been extensively investigated. Absorption studies were conducted using the Judd-Ofelt theory, revealing a trend of Ω₂ &gt; Ω₄ &gt; Ω₆, which indicates a highly asymmetric local environment around the Dy³⁺ ions. A prominent emission peak at 574 nm corresponding to the ⁴F₉/₂ → ⁶H₁₃/₂ transition was observed in all glass samples. Structural analysis revealed the presence of GeO₆ and GeO₄ units, 3-membered ring structures, and Q³ germanate networks, all of which influence the luminescence properties. The absolute photoluminescence quantum yield (PLQY) was measured under 350 nm excitation, showing values of 6.4 ± 0.4 %, 13.0 ± 0.6 %, 18.2 ± 0.8 %, and 25.2 ± 0.8 % for Dy, DG, DGF, and DGO glasses, respectively. Energy transfer efficiency was also evaluated, with the DGO sample exhibiting up to 25 % efficiency. Radioluminescence studies demonstrated that these glasses exhibit significant scintillation in the visible range. Overall, the findings suggest that Dy³⁺-doped germanate glasses have strong potential for white light-emitting applications under various excitation sources.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113054"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365446","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":"Exploring the atomic and electronic structures of low thermal conductivity materials using a combined XAS and DFT approach","authors":"Methus Suwannaruang ,&nbsp;Napat Triroj ,&nbsp;Thanayut Kaewmaraya ,&nbsp;Theeranuch Nachaithong ,&nbsp;Jintara Padchasri ,&nbsp;Pinit Kidkhunthod ,&nbsp;Jesper T.N. Knijnenburg ,&nbsp;Sora-at Tanusilp","doi":"10.1016/j.radphyschem.2025.113088","DOIUrl":"10.1016/j.radphyschem.2025.113088","url":null,"abstract":"<div><div>This study revealed the atomic and electronic structures of Sn(SbTe₂)₂ and ZrW₂O₈ using X-ray absorption spectroscopy (XAS) coupled with density functional theory (DFT) calculations. The XAS analysis of Sn(SbTe₂)₂ revealed that Sn predominantly existed in the +4 oxidation state, with spectral features closely resembling those of SnO₂. Sb was identified in the +3 oxidation state, consistent with the reference Sb₂O₃, while Te exhibited features characteristic of the −2 oxidation state, similar to those found in metal tellurides. These oxidation states suggest strong electron localization and structural stabilization effects within the ternary compound. The study of ZrW₂O₈ showed that Zr was predominantly 6-fold coordinated, which influenced its thermal properties. The DFT calculations indicated that both <em>α</em>- and <em>β</em>-ZrW₂O₈ were wide-band-gap semiconductors, with band gaps of 3.35 eV and 3.51 eV, respectively. While the <em>α</em>-ZrW₂O₈ band gap was consistent with theoretical predictions, it remained lower than experimental values. The phase transition from the <em>α</em> to <em>β</em> phase of ZrW₂O₈ led to increasing somewhat the energy band gap and enhancing p-type charge transport resulting in promising thermoelectric applications. These findings provided important atomic and electronic structural insights, revealing the mechanisms behind the low thermal conductivity in these materials. These results contributed to the design of advanced materials with optimized thermal properties, advancing energy efficiency and thermal management technologies.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113088"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307509","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":"Photo-thermal- luminescence traits of beta-ray irradiated fluoroborate glasses doped with Sm3+","authors":"O.I. Sallam ,&nbsp;Shrouk Farouk ,&nbsp;Magdy Mahmoud ,&nbsp;Nabil El-Faramawy","doi":"10.1016/j.radphyschem.2025.113086","DOIUrl":"10.1016/j.radphyschem.2025.113086","url":null,"abstract":"<div><div>The aim of this investigation was to study the photoluminescence (PL) and thermoluminescence (TL) of fluoroborate glasses doped with different weighted mole percentages of samarium oxide <strong>(</strong>Sm₂O₃) after exposure to ionizing radiation. The changes in PL and TL with different Sm concentrations in fluoroborate glass were studied. Based on the PL characterization, samarium (Sm³⁺) had a broad fluorescence spectrum; its emission peak was at λ_emi = 604 nm, with several excitation bands. The electronic transition from ⁶H_5/2 to ⁶P_3/2 at 408 nm had a maximum intensity and was used for emission spectrum studies. The excitation caused the samples to produce photons from ⁴G_5/2 to lower states ⁶H_5/2, ⁶H_7/2, ⁶H_9/2, and ⁶H_11/2, resulting in visible photoluminescence for radiative decay from reddish orange. The results indicated that glass containing 0.7 mol% of Sm₂O₃ exhibited the maximum NBOs as determined by PL. In addition to measuring changes in PL and TL at different doping concentrations, dosimetric properties, namely, signal dose-response, repeatability, lower detectible limit, and thermal fading were examined for the 0.7 mol doped samples. Results showed that both experimental and computational analysis methods indicated that the TL glow curves were composed of 10 overlapping carriers’ traps. The signal dose response study revealed linear behavior for most traps in the dose range of 22 Gy–1375 Gy. The estimated value of the low detectable limit was calculated to be 29.9 mGy.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113086"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335598","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":"Prompt gamma spectroscopy of metallic implants in proton therapy","authors":"Hsin-Hon Lin ,&nbsp;Chun-Yu Liu ,&nbsp;Mythra Varun Nemallapudi ,&nbsp;Chien-Yu Lin ,&nbsp;Kun-Ju Lin ,&nbsp;Chung-Chi Lee ,&nbsp;Tsi-Chian Chao","doi":"10.1016/j.radphyschem.2025.113073","DOIUrl":"10.1016/j.radphyschem.2025.113073","url":null,"abstract":"<div><div>The use of implanted markers for proton range verification has recently attracted increasing attention. This study investigates the feasibility of using prompt gamma (PG) emissions from metallic markers (aluminum, titanium, and silver) for proton range verification in proton therapy. Spectroscopic analysis of PG emissions was performed using a high-purity germanium (HPGe) detector, focusing on the Bragg peak region. Experimental results were validated against GATE/GEANT4 Monte Carlo simulations employing Binary Intranuclear Cascade (BIC) and Liège Intranuclear Cascade (INCL++) models. Distinct PG spectral lines were identified for aluminum (416, 440, 1368, 1810 keV), titanium (159, 889, 983, 1312 keV), and silver (633, 861, 875 keV). Both BIC and INCL++ hadronic models demonstrated consistent distribution patterns in the distal fall-off region, with silver and aluminum showing excellent concordance between experimental and simulated data. Although PG measurements from titanium showed 1–4 mm discrepancies in the distal fall-off region at 889 and 1312 keV, the overall depth-dependent profiles remained consistent. The results demonstrate that metal-generated PG signals are reliably detectable and suitable for proton range verification. This study represents the first experimental validation of PG depth distribution analysis for these metals, highlighting silver's exceptional signal-to-noise ratio at 633 keV and underscoring the potential for practical implementation in proton therapy range verification using high-resolution spectroscopic detection without complex collimation systems.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113073"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307508","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":"Heterogeneous ensemble of supervised learning algorithms with soft majority voting for more reliable identification of gamma-emitting radioisotopes based on plastic scintillator spectra","authors":"Khalil Moshkbar-Bakhshayesh","doi":"10.1016/j.radphyschem.2025.113081","DOIUrl":"10.1016/j.radphyschem.2025.113081","url":null,"abstract":"<div><div>The identification of gamma-emitting radioisotopes plays a critical role in various applications, including nuclear security, environmental monitoring, and medical diagnostics. However, the low energy resolution of plastic scintillators presents challenges in accurate radioisotope identification. This study proposes a heterogeneous ensemble of supervised learning (HEL) algorithms, incorporating logistic regression (LR), decision tree (DT), and k-nearest neighbors (k-NN), to enhance identification performance. The ensemble method leverages the strengths of each individual algorithm through soft majority voting (SMV(. Experimental gamma spectra from Co-60, Cs-137, Na-22, and Am-241 are analyzed, with extracted features applied to improve classification accuracy. Additionally, this study extends the methodology to identify mixture spectra containing multiple isotopes, a crucial challenge in radiation detection. The probabilistic outputs of HEL enable more precise characterization of mixed radiation sources. Performance evaluation, based on accuracy, precision, recall, and F1-score, demonstrated that HEL outperforms individual algorithms, exhibiting superior robustness against noise/uncertainties. The results confirm that the proposed ensemble method significantly enhances the reliability of gamma-emitting radioisotope identification compared to individual algorithms.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"237 ","pages":"Article 113081"},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338983","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}