Radiation Physics and Chemistry最新文献

{"title":"An OpenFOAM solver for radon migration in indoor spaces","authors":"Qifu Chen ,&nbsp;Chunyun Jiang ,&nbsp;Mei-Zhong Huang ,&nbsp;Yong Liu ,&nbsp;Qiucai Zhang ,&nbsp;Yourui Jiang ,&nbsp;Guoqing Liu ,&nbsp;Shengyang Feng","doi":"10.1016/j.radphyschem.2025.113311","DOIUrl":"10.1016/j.radphyschem.2025.113311","url":null,"abstract":"<div><div>Accurate numerical simulation of radon migration dynamics in indoor environments is critical for mitigating radon-induced health risks and enhancing air quality management strategies. However, there is a lack of dedicated solvers for this purpose. This paper presents the development of a novel OpenFOAM-based solver, RnFOAM, which uniquely integrates turbulent diffusion into radon migration modeling. The solver has two main components: radon migration model represented by a governing equation with transient, diffusion, advection, decay, and source terms; and k-ε turbulence model for simulating indoor airflow as the initial condition for advection velocity in the advection term of the radon migration model. We used the finite volume method (FVM) to numerically solve these equations. To validate the solver, an experimental setup was used to simulate radon emanating from concrete walls into indoor spaces. The results showed high prediction accuracy, with a maximum difference of no more than 15 % between simulated and measured values, and a minimum difference of just 0.9 %. The comparison results between the RnFOAM solver and the commercial software COMSOL Multiphysics show that the relative difference between the simulation results of the two for the same model is only 0.8 %, and the convergence speed of the RnFOAM solver is much higher than that of COMSOL Multiphysics. Finally, we simulated radon migration in an underground space and analyzed different ventilation strategies to identify effective methods for reducing radon concentration.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113311"},"PeriodicalIF":2.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060606","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":"Thermosensitive poly(tetrafluoroethylene) films grafted with N-vinylcaprolactam and methyl methacrylate by gamma radiation","authors":"Elisa Vázquez-Galván,&nbsp;Y. Aylin Esquivel-Lozano,&nbsp;Emilio Bucio","doi":"10.1016/j.radphyschem.2025.113310","DOIUrl":"10.1016/j.radphyschem.2025.113310","url":null,"abstract":"<div><div>This study presents the radiation-induced grafting of methyl methacrylate (MMA) and N-vinylcaprolactam (NVCL) by two step-method onto poly(tetrafluoroethylene) (PTFE, Teflon®) films. The effects of solvent, monomer concentration, and irradiation dose were studied for the second step: grafting of NVCL onto PTFE films previously modified with MMA (PTFE-g-MMA), to establish the best conditions for the synthesis of (PTFE-g-MMA)-g-NVCL thermo-responsive copolymers. The resulting material was characterized using Fourier Transform Infrared Spectroscopy with Attenuated Total Reflection (FTIR-ATR), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA). Additionally, physicochemical studies were performed, including limit swelling, drop water contact angle, and Lower Critical Solution Temperature (LCST). Finally, the loading and release of norfloxacin was studied for pristine PTFE, MMA-grafted, and (PTFE-g-MMA)-g-NVCL films, the latter being the one that was able to load and release the highest amount of drug, being a new material with potential biomedical applications.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113310"},"PeriodicalIF":2.8,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057359","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":"Modelling an XRF method for determining gilding thickness in silver cultural heritage objects without sample collection: case studies on 16th century Portuguese silverware","authors":"Catarina Lopes Cordeiro ,&nbsp;Carlo Bottaini ,&nbsp;Rui Bordalo ,&nbsp;Gonçalo de Vasconcelos e Sousa ,&nbsp;Sofia Pessanha","doi":"10.1016/j.radphyschem.2025.113300","DOIUrl":"10.1016/j.radphyschem.2025.113300","url":null,"abstract":"<div><div>In situ X-ray fluorescence is a non-invasive technique that is widely used in historical objects, namely in pieces of gilded silver, to determine the composition of the alloy and gilding. In the case of gilded silver, fire gilding was a mercury-based historical technique that is no longer practiced. Moreover, with traditional XRF analysis is possible to determine the thickness of the gilding by using given intensity ratios of the characteristic lines of silver. However, this requires the analysis of the substrate, for the calculation of the intensity ratio without gilding, which is not always accessible. This study presents and validates a methodology for the calculation of the thickness of fire gilding silver pieces using XRF analysis with a commercial spectrometer and without the need to analyse the isolated substrate. Six silver alloy mock-up samples were produced following historical techniques and generic intensity ratio for Kα and Kβ lines of silver in the alloy was calculated (6.35 ± 0.05), to be used in any alloy with a silver composition over 75 %. Since attenuation of the silver's characteristic lines depends on the gilding composition, different Hg concentrations (5 %–20 %) were tested. The results obtained with this approach for the mock-ups was compared with SEM-EDS measurements for gauging uncertainty and the methodology was then applied to three pieces of 16th century Portuguese silverware. This adaptation of previously established principles, proved to be effective to calculate the thickness of fire gilding on silver and was validated to be applied, <em>in situ</em>, in real museum artworks without the need for sample collection.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113300"},"PeriodicalIF":2.8,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057375","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":"Natural background radiation in authentication of ink-print documents","authors":"D.A. Bradley ,&nbsp;A. Taheri ,&nbsp;S.E. Lam ,&nbsp;S.N. Mat Nawi ,&nbsp;M.U. Khandaker ,&nbsp;M. Alkhorayef","doi":"10.1016/j.radphyschem.2025.113301","DOIUrl":"10.1016/j.radphyschem.2025.113301","url":null,"abstract":"<div><div>This investigation concerns a novel possibility in examining the authenticity of ink-print media, acknowledging that within such printed material there could well be items for which cultural heritage may be claimed. A key study feature is that within the printed page it is the ink that provides the greatest localization of carbon content. Underpinning the work is use of Raman spectroscopy in inspecting the ink, the carbon revealing the storing of defects accumulated over time from exposure to the natural background radiation that prevails. This realization points to a possibility for use of this in provenance studies based on the age of a document. Prior studies have shown that atomic displacements, and the associated increase in defect density that occur over time, arise out of such low linear energy transfer (LET) irradiations. Underpinned by the need for the long-term storage of the defects to endure over periods of many hundreds of years and more, the central question tested is whether interrogation of the carbon-rich ink provides sufficient basis to allow detection of these time-dependent alterations. Accordingly, we report results from an exploratory study of book-print ink in European texts, obtained using a small set of personally acquired books published between the late 16th and early 19th centuries. Across the 200-year period of study a steady reduction is found in the integral intensity of the Raman spectrum of the ink, decreasing as a function of recency, amounting to an overall estimate of some 30 %.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113301"},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057370","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":"Tb3+ doped Na2O-CaO-Al2O3-B2O3 scintillating glass: calibration material for luminescence spectrometers and X-ray imaging application","authors":"N. Jarucha ,&nbsp;Y. Ruangtaweep ,&nbsp;P. Meejitpaisan ,&nbsp;H.J. Kim ,&nbsp;P. Boontueng ,&nbsp;C. Kobdaj ,&nbsp;N. Ritjoho ,&nbsp;T. Sanghangthum ,&nbsp;D. Valiev ,&nbsp;S. Stepanov ,&nbsp;P. Pakawanit ,&nbsp;C. Phoovasawat ,&nbsp;N. Intachai ,&nbsp;S. Kothan ,&nbsp;P.H. Minh ,&nbsp;P.V. Duong ,&nbsp;A. Nishikawa ,&nbsp;T. Kunikata ,&nbsp;T. Kato ,&nbsp;T. Yanagida ,&nbsp;J. Kaewkhao","doi":"10.1016/j.radphyschem.2025.113302","DOIUrl":"10.1016/j.radphyschem.2025.113302","url":null,"abstract":"<div><div>This study reports the synthesis and detailed characterization of Tb³⁺ doped sodium aluminum calcium borate (TbACNB) glasses, developed via melt-quenching, with the aim of establishing reliable luminescent calibration standards and X-ray imaging scintillators. A systematic investigation of photoluminescence, radioluminescence, proton-induced luminescence, and cathodoluminescence confirms a dominant and stable green emission centered at 546 nm, corresponding to the ⁵D₄→⁷F₅ transition of Tb³⁺ ions. Among all tested concentrations, the 6 mol% Tb₂O₃ doped glass exhibits the highest photoluminescence quantum yield of 25.67 %, optimal decay lifetime, and consistent emission peak positions across all excitation methods, indicating structural and spectral stability. Proton and X-ray irradiation studies demonstrate linear dose response behavior and high spatial resolution up to 10 lp/mm, validating the glass applicability for high-resolution X-ray imaging. The glass retains uniform luminescence and color stability, with CIE coordinates at (0.31, 0.60), confirming its potential as a fluorescence calibration reference. The novelty of this work lies in demonstrating multi-stimulus luminescence consistency, dose dependent response, and X-ray imaging, positioning 6TbACNB as a dual purpose material for optical calibration and X-ray imaging systems.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113302"},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109284","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 material identification method for waste metals based on multi-energy X-ray transmission","authors":"Dongyang Wang ,&nbsp;Xiongjie Zhang ,&nbsp;Bin Qiu ,&nbsp;Hongze Liu ,&nbsp;Wenming Dong ,&nbsp;Bao Wang ,&nbsp;Ziyan Yu ,&nbsp;Qiang Hu ,&nbsp;Qi Liu ,&nbsp;Renbo Wang ,&nbsp;Bin Tang","doi":"10.1016/j.radphyschem.2025.113297","DOIUrl":"10.1016/j.radphyschem.2025.113297","url":null,"abstract":"<div><div>Accurate material identification is critical for non-destructive and high-throughput metal recycling systems. Conventional dual-energy X-ray transmission (DE-XRT) techniques often struggle to distinguish metals with similar atomic numbers or variable thicknesses, limiting their effectiveness in automated sorting applications. In this study, a multi-energy X-ray transmission (ME-XRT) method is proposed, which defines three functional energy regions—normalization, material-specific, and thickness-sensitive—to extract spectral features relevant to both classification and thickness estimation. An experimental system based on a CdTe photon-counting detector was developed to acquire full-spectrum transmission data from stepped aluminum, iron, and copper samples. The method achieved accurate material identification across wide thickness ranges and demonstrated strong linear correlations between spectral features and material thickness. Compared to DE-XRT, the ME-XRT approach provided superior performance, particularly in differentiating compositionally similar metals. These results confirm the potential of ME-XRT as a reliable, non-invasive technique for advanced waste metal detection, offering practical value for intelligent recycling systems and sustainable resource recovery.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113297"},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057371","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":"Pure green and pure red upconversion luminescence due to different distributions of Er3+/Yb3+ in tantalate","authors":"Xu Liu,&nbsp;Yongze Cao,&nbsp;Yuhan Fan,&nbsp;Meiling Li,&nbsp;Sai Xu,&nbsp;Jinsu Zhang,&nbsp;Yichao Wang,&nbsp;Baojiu Chen","doi":"10.1016/j.radphyschem.2025.113296","DOIUrl":"10.1016/j.radphyschem.2025.113296","url":null,"abstract":"<div><div>The Rb₄Ta₆O₁₇:Er³⁺/Yb³⁺ upconversion luminescence (UCL) powders were prepared by using ion-exchange intercalation growth method. When the concentration of Er³⁺ is 10 mol% and that of Yb³⁺ is 30 mol%, the pure green UCL intensity is the highest under 980 nm laser excitation. This pure green UCL is attributed to the 2D layered distribution of Er³⁺/Yb³⁺. The Rb₄Ta₆O₁₇:0.1Er³⁺/0.3Yb³⁺ sample was subjected to heat treatment at different temperatures, and the Rb₄Ta₆O₁₇ structure transformed into the Rb₄Ta₁₁O₃₀ structure above 800 °C. The Rb₄Ta₁₁O₃₀:Er³⁺/Yb³⁺ shows pure red UCL under 980 nm laser excitation. The energy transfer (ET) from Yb³⁺ to Er³⁺ occurs in the four layers space of Rb₄Ta₁₁O₃₀, which increases the space of energy transfer and cross relaxation with leading to pure red UCL emission. Based on the luminescence intensity ratio (LIR) technology, the relative temperature sensitivity can reach 1.527 % K⁻¹. This experiment demonstrated that by adjusting the spatial distribution of Er³⁺/Yb³⁺ in the tantalate, pure green or pure red UCL can be achieved. Rb₄Ta₆O₁₇:Er³⁺/Yb³⁺ and Rb₄Ta₁₁O₃₀:Er³⁺/Yb³⁺ can be used for pure color luminescence display and temperature sensing.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113296"},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057369","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":"Study of the radiation environment during 1H irradiation of metallic natMo target: The accelerator pathway for 99mTc production","authors":"Sabyasachi Paul ,&nbsp;G.S. Sahoo ,&nbsp;S.P. Tripathy ,&nbsp;P. Srinivasan ,&nbsp;Maitreyee Nandy ,&nbsp;A.A. Shanbhag ,&nbsp;S.C. Sharma ,&nbsp;P. Chaudhury","doi":"10.1016/j.radphyschem.2025.113293","DOIUrl":"10.1016/j.radphyschem.2025.113293","url":null,"abstract":"<div><h3>Objective</h3><div>Growing requirement of ⁹⁹Mo for cancer diagnosis need urgent alternative from the conventional enriched ²³⁵U based reactor technology considering its proliferation potential, prolonged operations for decades needing refurbishment and major upgrades and elaborate distribution network for catering the worldwide requirements. Previously, the reactor shutdown at NRU in 2009 and distribution disruption in 2020 due to COVID-19 has showed the need of a localized ⁹⁹Mo production setup. The proton accelerator pathway can be an efficient solution for a compact and low cost ⁹⁹Mo production facility. However, studies regarding the radiation protection and decommission plan need to be explored beforehand.</div></div><div><h3>Methods</h3><div>Present work focuses on the quantification of secondary radiations (neutron and photon) emitted during proton bombardment on natural Mo target during ⁹⁹Mo and/or ⁹⁹Tc production. Experiments were performed at BARC-TIFR Pelletron Facility, India with proton bombardment on thick Mo targets with incident energies between 8 and 22 MeV followed by measurement of secondary emission spectra and the ambient dose equivalents.</div></div><div><h3>Results</h3><div>The measured emission neutron ambient dose equivalents are found to dominate over photons and the neutron peak energy remains almost invariant in the entire incident proton energy range. However, the neutron fluence enhances significantly with an enhancement factor of 60 as the proton energy increases from 8 to 22 MeV. The photon ambient dose equivalent rates were found to increase by more than 30 times with increasing proton energies.</div></div><div><h3>Conclusion</h3><div>The results clearly indicate that during design of a compact accelerator-based facility for ⁹⁹Mo production need careful consideration regarding secondary radiations.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113293"},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026548","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":"Relativistic atomic structure and electron impact excitation calculations for K-like Kr17+ and Xe35+: A detailed study for fusion plasma relevance","authors":"Nitish Ghosh,&nbsp;Lalita Sharma","doi":"10.1016/j.radphyschem.2025.113273","DOIUrl":"10.1016/j.radphyschem.2025.113273","url":null,"abstract":"<div><div>We present a detailed investigation of the atomic structure and electron-impact excitation properties of K-like Kr<span><math><msup><mrow></mrow><mrow><mn>17</mn><mo>+</mo></mrow></msup></math></span> and Xe<span><math><msup><mrow></mrow><mrow><mn>35</mn><mo>+</mo></mrow></msup></math></span> ions, focusing on the fine-structure states arising from the configurations <span><math><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>6</mn></mrow></msup><mn>3</mn><mi>d</mi></mrow></math></span>, <span><math><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>5</mn></mrow></msup><mn>3</mn><msup><mrow><mi>d</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, <span><math><mrow><mn>3</mn><mi>s</mi><mn>3</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>6</mn></mrow></msup><mn>3</mn><msup><mrow><mi>d</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, and <span><math><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>4</mn></mrow></msup><mn>3</mn><msup><mrow><mi>d</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>. Calculations are performed using the fully relativistic multiconfiguration Dirac-Hartree–Fock (MCDHF) method, as implemented in the GRASP2018 code, with inclusion of the Breit interaction and quantum electrodynamic corrections. We report energy levels for the lowest 90 states and provide transition data for E1, M1, E2, and M2 transitions among these levels. The impact of virtual orbital choices on the generated wavefunctions is analyzed. To assess the reliability of our results, we estimate uncertainties in line strengths from the MCDHF calculations. Additionally, we perform independent calculations using many-body perturbation theory (MBPT) within the Flexible Atomic Code to validate our findings. The close agreement between MCDHF and MBPT results supports the robustness of our predictions. Furthermore, electron-impact excitation cross sections are calculated using relativistic distorted wave theory for transitions originating from the ground and first excited levels, spanning incident electron energies up to 5 keV for Kr<span><math><msup><mrow></mrow><mrow><mn>17</mn><mo>+</mo></mrow></msup></math></span> and 10 keV for Xe<span><math><msup><mrow></mrow><mrow><mn>35</mn><mo>+</mo></mrow></msup></math></span>. The corresponding rate coefficients are derived for Maxwellian electron energy distributions over electron temperature ranges of 15–150 eV for Kr<span><math><msup><mrow></mrow><mrow><mn>17</mn><mo>+</mo></mrow></msup></math></span> and 25–200 eV for Xe<span><math><msup><mrow></mrow><mrow><mn>35</mn><mo>+</mo></mrow></msup></math></span>. We also provide fitting parameters for these rate coefficients to facilitate their use in plasma modeling. The present data set addresses the lack of at","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113273"},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057372","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":"Optical investigation of novel butterfly pea flower extract (BPFE) modified MAGAT polymer gel for 3D dosimetry and radiotherapy applications","authors":"Oke A.O. ,&nbsp;Iskandar S.M. ,&nbsp;Azhar A.R. ,&nbsp;Ahmad Lutfi Yusoff ,&nbsp;Efenji Godwin ,&nbsp;Nabasu Seth Ezra ,&nbsp;Hayder Salah Naeem ,&nbsp;Fadhirul I.M. ,&nbsp;Alhassan Muhammad ,&nbsp;Ode Samuel Omenka","doi":"10.1016/j.radphyschem.2025.113298","DOIUrl":"10.1016/j.radphyschem.2025.113298","url":null,"abstract":"<div><div>Radiation therapy requires precise dosimetry for safety and effective delivery. This study presents the development and optical analysis of a novel modified methacrylic acid (MAA), gelatin, and tetrakis hydroxymethyl phosphonium chloride (MAGAT) polymer gel modified with Butterfly Pea Flower Extract (BPFE). The addition of BPFE was explored to enhance the dose-response of the MAGAT gel. Five concentrations of BPFE (2, 5, 10, 20, and 50 wt%) were each combined with 3 wt% and 6 wt% of methacrylic acid to develop the modified gel. Maltose (18.2 wt%) was added to the formulation to increase the sensitivity and gelation strength of the gel, while NaOH (30–60 mM) provided the pH balance for the composition. The spectrophotometric analysis of low-dose X-ray irradiated gel (50 mGy – 1Gy) reveals two distinct peaks (573 nm and 620 nm) in most of the compositions. The composition with 2 wt% BPFE exhibits the highest sensitivity (0.12298 ± 0.003 a.u.Gy⁻¹). FTIR analysis of the gel reveals the presence of functional groups like C<img>O, C–O–C, O–H, and C<img>C, which represent the characteristics of the anthocyanin compound group in the modified gel. Gel composition above 10 wt% BPFE and 6 wt% MAA resulted in pre-polymerization. Am-241 (gamma source) produces dense ionization resulting in the colour change of the gels. The improvement in the dose-response and sensitivity at this diagnostic range suggests that the result is suitable for dosimetry within the dose range studied. The colour shift upon exposure will assist in reducing the amount of time spent on analysis during treatment planning.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113298"},"PeriodicalIF":2.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026546","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}