Radiation Physics and Chemistry最新文献

{"title":"Unveiling the Dosimetric Potential of Natural Malaysian Zeolite Powder: A Comprehensive Thermoluminescent Study","authors":"S.N. Mat Nawi ,&nbsp;Mayeen Uddin Khandaker ,&nbsp;N.S. Mohd Nor Ihsan ,&nbsp;A.I. Masdukin ,&nbsp;Hamid Osman ,&nbsp;D.A. Bradley ,&nbsp;R. Ajaj ,&nbsp;Zaenal Arifin ,&nbsp;S.F. Abdul Sani","doi":"10.1016/j.radphyschem.2025.113280","DOIUrl":"10.1016/j.radphyschem.2025.113280","url":null,"abstract":"<div><div>Zeolite is a microporous crystalline material composed of hydrated aluminosilicates of alkali and alkaline earth metals, available in both natural and synthetic forms and commonly used in its powdered state. This study investigates the thermoluminescence (TL) properties of natural zeolite powder under gamma irradiation in the dose range of 0.5–150 Gy. TL glow curve measurements at heating rates of 2–15 °C/s revealed an optimal rate of 8 °C/s for maximizing TL response. The material exhibited a good linear dose response, high sensitivity at low doses, excellent reproducibility, and a fading of approximately 27% after 28 days. The effective atomic number (Z_eff = 11.53) closely matches that of human bone (11.6–13.8), underscoring its potential for medical dosimetry. Kinetic parameter evaluation further confirmed stable glow peak behavior, with activation energies and trap lifetimes indicating moderately stable trapping centers, thereby reinforcing the reproducibility and reliability of the zeolite TL response. Overall, these findings establish natural zeolite powder as a low-cost, efficient, and sustainable candidate for radiation detection and medical applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113280"},"PeriodicalIF":2.8,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004652","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 and limitations of a postal dosimetry audit system using RPLGD for high-dose-rate brachytherapy","authors":"Hyeok-Jun Gwon ,&nbsp;Wonho Lee ,&nbsp;Sang-Hyoun Choi ,&nbsp;Kum Bae Kim","doi":"10.1016/j.radphyschem.2025.113285","DOIUrl":"10.1016/j.radphyschem.2025.113285","url":null,"abstract":"<div><div>International recommendations and South Korean regulations emphasize the need for dosimetry audit systems to ensure treatment accuracy in high-dose-rate brachytherapy. In this study, we designed and tested a prototype polycarbonate postal audit phantom to assess its feasibility. Using six GD-302M radiophotoluminescent glass dosimeters. Dose measurements were performed at points A and B based on the treatment planning system (TPS) and PHITS. These were validated in the Korea laboratory accreditation scheme and secondary standard dosimetry laboratory using Co-60 beam. Reproducibility and linearity tests showed stable responses; however, a maximum deviation of 13.5 % was observed between the measured and TPS doses at point A. The PHITS simulations revealed that the TPS overestimated the dose by approximately 10 %, whereas glass dosimeters showed up to 20 % overestimation because of low-energy gamma rays from the Ir-192 source. Additional water phantom measurements demonstrated that the RPLGD can provide reasonably consistent dose readings under water-equivalent conditions. The discrepancies observed in the audit phantom were found to follow a consistent trend and could be assessed using normalization. The combined expanded uncertainties were calculated as 3.1 % and 3.2 % (<em>k</em> = <em>2</em>) for the source holder models 70010 and 72280, respectively. The audit phantom showed potential for application in nationwide postal audits, pending further validation. To ensure clinical applicability, future work should focus on addressing the energy dependence of the RPLGD and conducting a multi-institutional pilot study.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113285"},"PeriodicalIF":2.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004729","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":"Effect of Dy3+ concentration on the luminescence properties of Dy3+/Gd3+ co-doped in barium sodium borate glass scintillators","authors":"N. Luewarasirikul ,&nbsp;S. Sarachai ,&nbsp;N. Intachai ,&nbsp;S. Kothan ,&nbsp;M. Djamal ,&nbsp;J. Kaewkhao","doi":"10.1016/j.radphyschem.2025.113282","DOIUrl":"10.1016/j.radphyschem.2025.113282","url":null,"abstract":"<div><div>A series of Dy³⁺/Gd³⁺ co-doped Ba–Na–N glasses were synthesized via the melt-quenching method and investigated for their photoluminescence (PL) and radioluminescence (RL) properties. Under 387 nm excitation (Dy³⁺ ions), the sample containing 1.0 mol% Dy₂O₃ exhibited the strongest PL intensity, achieved a photoluminescence quantum yield (PLQY) of 7.59 %. Upon 275 nm excitation (Gd³⁺ ions), efficient energy transfer from Gd³⁺ to Dy³⁺ was observed, with the strongest PL intensity obtained in the 0.5 mol% Dy₂O₃ sample. Chromaticity coordinates of all samples were located near (x = 0.37, y = 0.42), confirming their white-light emission capability. For RL measurements under X-ray excitation, the 0.50 mol% Dy₂O₃ glass sample reached an integral scintillation efficiency of 14.84 % relative to a commercial BGO standard. These results highlight the potential of the developed glasses in this work for use in white light-emitting devices and cost-effective X-ray scintillators.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113282"},"PeriodicalIF":2.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004653","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":"Computational analysis of deposited energy, internal collision mechanisms, and photon absorption properties in radiomimetic compounds using Monte Carlo simulations","authors":"Duygu Sen Baykal ,&nbsp;Ghada ALMisned ,&nbsp;Ceyda Sibel Kilic ,&nbsp;H.O. Tekin","doi":"10.1016/j.radphyschem.2025.113284","DOIUrl":"10.1016/j.radphyschem.2025.113284","url":null,"abstract":"<div><div>This study presents a comprehensive theoretical evaluation of the photon interaction behavior of selected radiomimetic compounds such as Bleomycin, Talazoparib, Neocarzinostatin (NCS), Chromophore (C-1027), and Calicheamicin (Cali) using advanced Monte Carlo-based simulation tools and radiation transport codes. The simulations were conducted using PHITS code in a water-based spherical phantom model to investigate energy deposition, collision parameters, and particle transport behavior. Complementary photon attenuation parameters, including mass attenuation coefficients, half-value layers, atomic cross-sections, and exposure buildup factors, were also calculated using Phy-X/PSD. The results show distinct differences in the physical interaction profiles of the compounds, with Calicheamicin demonstrating notably higher photon attenuation and energy deposition, likely due to the presence of high-Z elements in its structure. These findings are based on Monte Carlo-based simulation results and are intended to provide a foundational understanding of the physical interaction mechanisms of radiomimetic materials under photon irradiation. No biological or therapeutic interpretations are made, and the results are intended to inform future experimental or interdisciplinary research.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113284"},"PeriodicalIF":2.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989127","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":"Prediction of thick-target yields for medical radionuclide production based on automated machine learning","authors":"YanBang Tang","doi":"10.1016/j.radphyschem.2025.113281","DOIUrl":"10.1016/j.radphyschem.2025.113281","url":null,"abstract":"<div><div>Accurate knowledge of thick-target yields (TTY) is critical for the efficient and reliable production of medical radionuclides. In this study, we developed and evaluated a suite of machine learning models to perform prediction of the TTY for four medically relevant (p,n) reactions: ¹⁶⁷Er(p,n)¹⁶⁷Tm, ⁵⁸Fe(p,n)^58mCo, ¹¹⁹Sn(p,n)¹¹⁹Sb, and ¹⁸⁶W(p,n)^186gRe. A unified dataset was curated from the IAEA's evaluated data library. Physics-informed features, including the proton, neutron, and mass numbers of both the target and product nuclides, were engineered to provide a physical context for the models. The performance of fourteen algorithms, including ensemble methods, kernel-based models, and a Automated Machine Learning (AutoML) framework, Autogluon, was systematically evaluated. The Autogluon model demonstrated strong predictive performance, achieving a high coefficient of determination (R² = 0.999995) and a low root mean squared error (RMSE = 0.021 MBq/μA·h) on a held-out test set. It outperformed all other models, particularly simple linear models (R² &lt; 0.5) which failed to capture the non-linear nature of the yield curves. The model closely reproduced the TTY curves for four individual reactions in trained data this study. The observed large relative errors were confined to physically insignificant, near-threshold energy regions where absolute errors were negligible. This work presents a successful application of machine learning for the prediction of thick-target yields. The results establish that data-driven models, particularly those developed through AutoML, show promise as a complementary tool for nuclear data evaluation, supporting the optimization of radionuclide production for medical applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113281"},"PeriodicalIF":2.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988994","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":"Effect of SnO2 nanoparticles on the formation of radicals under the X-ray irradiation of aqueous organic system: an evidence for new mechanism of chemical enhancement","authors":"Anzhelika I. Vanina ,&nbsp;Ekaterina S. Shiryaeva ,&nbsp;Irina A. Baranova ,&nbsp;Elizaveta V. Sanochkina ,&nbsp;Anastasia А. Grebenkina ,&nbsp;Valeriy V. Krivetskiy ,&nbsp;Alexandr V. Belousov ,&nbsp;Vladimir I. Feldman","doi":"10.1016/j.radphyschem.2025.113278","DOIUrl":"10.1016/j.radphyschem.2025.113278","url":null,"abstract":"<div><div>The increasing rate of radical production under X-ray irradiation of aqueous-organic systems in the presence of metal and oxide nanoparticles (NPs) attracts considerable attention in view of various potential applications. This phenomenon is usually rationalized in terms of physical and chemical enhancement (PE and CE, respectively). In the present study using spin trapping technique, it was shown that the rate of radical production in a model oxygen-free aqueous organic system (water + methanol) irradiated with X-rays (45 kVp) increases by the factor of (1.45 ± 0.11) in the presence of 0.13 wp SnO₂ nanoparticles (NPs) with an average diameter of 5–6 nm (as compared to the reference samples without NPs). The effect becomes negligible for the larger NPs. In this case the role of PE is definitely minor, because the absorbed dose in the presence of NPs increases only by the factor of 1.02 as shown by the Monte-Carlo simulations. Based on kinetic consideration and observed size effect, the result was explained by a specific kind of CE mechanism, which implies reduction of SnO₂ at the NP surface yielding (SnO₂)_n^•‒ followed by generation of additional ^•H atoms eventually reacting with methanol. The proposed mechanism is important for better understanding of the role of oxide NPs in the radical reactions occurring under X-ray irradiation of aqueous organic media and biological systems.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113278"},"PeriodicalIF":2.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144932837","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":"Comparative evaluation of absorbed doses in silver wedge-filter-based chest CT versus chest radiography: A Monte Carlo study","authors":"Yusei Nishihara ,&nbsp;Masanao Kobayashi ,&nbsp;Akari Satake ,&nbsp;Tsuzuki Tadasuke ,&nbsp;Rei Ito ,&nbsp;Tomonobu Haba ,&nbsp;Shigeki Kobayashi","doi":"10.1016/j.radphyschem.2025.113274","DOIUrl":"10.1016/j.radphyschem.2025.113274","url":null,"abstract":"<div><div>In the silver (Ag) wedge-filter-fitted computed tomography (CT) scanner, we estimated organ doses during chest CT examinations and chest radiography to assess the Ag-filter-based dose reduction in six scan protocols for chest CT: three conventional protocols with standard filters (clinical standard, low-dose, and ultra-low-dose) and three corresponding Ag-filter-based protocols; the tube current was adjusted to maintain similar standard deviations (SD) and two protocols for chest radiography: posteroanterior (PA) projection (medical checkups) and posteroanterior with right-left (PA + RL) projection (clinical protocols). Using the Monte Carlo simulation software (ImpactMC), we estimated absorbed doses by simulating photon transport in computational phantoms (adult males and females) based on average values for organ doses (lungs, breast tissue, heart, stomach, and liver) and the maximum value for the skin dose. Despite similar SD, the organ and tissue doses in the Ag filter-based ultra-low-dose chest CT protocol (vs. no-Ag filter) were lower for females: skin (39.6 %), lung (17.4 %), breast tissue (20.1 %), heart (16.5 %), stomach (14.4 %), and liver (16.7 %), with similar dose reductions across other scan protocols. In the ultra-low-dose Ag-filter-based chest CT protocol, the absorbed doses resembled those of PA + RL radiography (clinical protocol). During chest CT examinations, the Ag filter-based effective reduction of the radiation dose conferred a potentially significant impact on the risk–benefit balance in CT-based lung cancer screening; this potentially influences the screening targets and overall effectiveness. By balancing radiation risk and diagnostic benefits, the Ag filter facilitates a paradigm shift from radiography to ultra-low-dose CT examinations in conventional diagnosis and follow-up.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113274"},"PeriodicalIF":2.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026547","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":"Validation and investigation of mass attenuation Coeffcients calculations in different parts of adult human body organ using GAMOS code","authors":"Hassan Al Kanti ,&nbsp;A. Arectout ,&nbsp;O. El Hajjaji ,&nbsp;T. El Bardouni ,&nbsp;Murad Al Mugahed","doi":"10.1016/j.radphyschem.2025.113271","DOIUrl":"10.1016/j.radphyschem.2025.113271","url":null,"abstract":"<div><div>This article aims to validate and investigate the interaction parameters of mono-energies photons from 0.01 to 10 MeV in adult human body organs using Monte Carlo (MC) simulation. The Mass Attenuation Coefficients (MAC), Mean Free Path (MFP), Half Value Layer (HVL), and Tenth Value Layer (TVL), of the liver (healthy), liver (cirrhotic), liver (fatty), eye lens, skin, kidney, heart (healthy), and heart (fatty) were calculated. Additionally, we studied the effect of healthy cirrhotic and fatty organs on the MAC calculations. The GAMOS code MC and theoretical Method were used for calculating in this work. The results obtained were compared to those published with the ICRU-46 report. The data showed a good agreement, with a Relative difference in the calculation of less than 10 %. We have validated the GAMOS code for calculating the MAC for mono-energetic photons. It can be concluded that computing tools are successful and powerful in determining the MAC of any energies and organ tissues.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113271"},"PeriodicalIF":2.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144932836","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":"Radioactivity and toxic element concentrations in soil and food crops from a copper mining area in Uganda: Environmental and public health implications","authors":"Evarist R.S. Turyahabwa ,&nbsp;Farooq Kyeyune ,&nbsp;Eric Mucunguzi ,&nbsp;Akisophel Kisolo ,&nbsp;Manny Mathuthu","doi":"10.1016/j.radphyschem.2025.113276","DOIUrl":"10.1016/j.radphyschem.2025.113276","url":null,"abstract":"<div><div>Mining activities can lead to the accumulation of radionuclides and metallic elements in surrounding soils, posing risks to food safety and human health. This study assessed radioactivity and contamination with toxic elements in 18 soil and food crop samples from the Kilembe copper mining area in Western Uganda to evaluate potential public health impacts. The samples were analysed for ²²⁶Ra, ²³²Th, and ⁴⁰K using high-purity germanium (HPGe) gamma spectrometry, while concentrations of Cr, Cu, Co, Ni, Pb, and As were determined using inductively coupled plasma mass spectrometry (ICP-MS). The mean activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K in soils were 71.16 ± 40.87, 50.85 ± 9.01, and 823.70 ± 231.58 Bq kg⁻¹, respectively, all exceeding world averages. In food crops, ⁴⁰K levels (1066.51 ± 224.71 Bq kg⁻¹) were also elevated. The estimated annual committed effective dose exceeded the ICRP safety limit of 1 mSv y⁻¹ for infants and children, while the excess lifetime cancer risk surpassed the 2.9 × 10⁻⁴ threshold for all age groups. Annual organ-specific dose estimates revealed increased risks to the gastrointestinal tract and bone surfaces. Metallic element analysis showed high concentrations of Cu (541.05 ± 389.83 mg kg⁻¹) and Pb (64.99 ± 32.93 mg kg⁻¹) in soils, with Pb levels in crops exceeding the WHO/FAO limit by 20 %. The health hazard indices for Cu, Pb, and As were above unity in both children and adults, indicating significant non-carcinogenic risks. Total cancer risks from Pb and As were (2.91 ± 1.27) × 10⁻³ (children) and (1.67 ± 0.73) × 10⁻³ (adults), which exceeded acceptable thresholds. Statistical analysis indicated shared geochemical behaviour of radionuclides and metals in soils, but distinct uptake pathways in food crops. These findings highlight the need for environmental monitoring, mining waste remediation, and regulating food sources to reduce radiological and chemical health risks in the study area.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113276"},"PeriodicalIF":2.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922531","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":"One-step gamma radiation-induced grafting of poly(N-vinylcaprolactam) and poly(methacrylic acid) onto polypropylene suture threads","authors":"Luis A. Flores-García,&nbsp;Felipe López-Saucedo,&nbsp;Emilio Bucio","doi":"10.1016/j.radphyschem.2025.113279","DOIUrl":"10.1016/j.radphyschem.2025.113279","url":null,"abstract":"<div><div>This study presents the one-step grafting of <em>N</em>-vinylcaprolactam (NVCL) and methacrylic acid (MAAc) onto polypropylene (PP) suture threads using gamma radiation. A 1:1 solution of the monomers was applied directly to the PP substrate and irradiated to induce graft copolymerization. The effects of monomer concentration and absorbed gamma-ray dose were evaluated, as they influenced the degree of grafting achieved. The thermal and mechanical properties of the grafted material, PP-g-(NVCL-co-MAAc), were analyzed to assess its potential functionality. The results suggest that the modified suture is a promising candidate for use in controlled drug-loading and release systems in biomedical and sanitary applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113279"},"PeriodicalIF":2.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920334","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}