Radiation Physics and Chemistry最新文献

{"title":"Evaluation of radiation dose and cancer risk for paediatric digital radiography in a Moroccan hospital","authors":"Noureddine Elamri,&nbsp;Mustapha bougteb,&nbsp;Maroine Tahiri,&nbsp;Redouane El Baydaoui,&nbsp;Mounir Mkimel","doi":"10.1016/j.radphyschem.2024.112352","DOIUrl":"10.1016/j.radphyschem.2024.112352","url":null,"abstract":"<div><div>Pediatric radiography is the first line of most diagnostic examinations and an effective tool that provides important information about the patient's health status.</div><div>This study aims to investigate the Entrance Surface Dose (ESD) and organ doses for pediatric patients undergoing imaging procedures of the abdomen, chest, pelvis, and nasopharynx using Optically Stimulated Luminescence Dosimeters OSLDs and an anthropomorphic phantom.</div><div>An ATOM pediatric 5-year-old phantom was imaged using a Digital Radiography (DR) based on similar conditions of routine radiography (exposure parameters kVp, mAs, SID: Source Image receptor Distance). The OSLDs were inserted at the appropriate sites to measure localized doses in the sensitive organs.</div><div>The results showed that the entrance surface doses for the pediatric patients were 0.17 ± 0.03 mGy, 0.10 ± 0.00 mGy, 0.46 ± 0.00 mGy, and 0.42 ± 0.02 mGy, respectively, for the abdomen (AP), chest (AP), pelvis (AP), and nasopharynx (LAT). The range of organ doses were 0.05–0.45 mGy, 0.01–0.44 mGy, 0.13–1.05 mGy, and 0.084–0.99 mGy for the abdomen, chest, pelvis, and nasopharynx examination, respectively. Effective doses (ED) were 0.088 ± 0.021 mSv, 0.011 ± 0.004 mSv, 0.058 ± 0.007 mSv, and 0.044 ± 0.024 mSv for the abdomen, chest, pelvis, and nasopharynx examination, respectively.</div><div>The likelihood of cancer, as determined by the ICRP health risk model with a rate of 500 cases per 10 000 person-Sv (5% per sievert), estimated that a 0.015 case of health risk (0.3 person-Sv × 5% per sievert) may in the future be attributable to four X-ray pediatric procedures conducted in 2022.</div><div>The ESD, ED, and organ dose values are deemed acceptable compared to those reported in the literature. Although the risk of incidence and mortality from cancer during life is minimal, it should not be ignored.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112352"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664150","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":"Initial results of hard X-ray spectroscopy by LaBr3(Ce) detector for runaway electron study in Thailand Tokamak-1","authors":"Kitti Rongpuit ,&nbsp;Apiwat Wisitsorasak ,&nbsp;Siriyaporn Sangaroon ,&nbsp;Kunihiro Ogawa ,&nbsp;Nakarin Pattanaboonmee ,&nbsp;Weerapong Chewpraditkul ,&nbsp;Suwat Tangwancharoen ,&nbsp;Suebsak Suksaengpanomrung ,&nbsp;Arlee Tamman ,&nbsp;Boonyarit Chatthong ,&nbsp;Nopporn Poolyarat ,&nbsp;Mitsutaka Isobe","doi":"10.1016/j.radphyschem.2024.112346","DOIUrl":"10.1016/j.radphyschem.2024.112346","url":null,"abstract":"<div><div>Thailand Tokamak-1 (TT-1) successfully achieved its first plasma operation in early 2023. Understanding the behavior of high-energy runaway electrons (RE) during plasma discharges is crucial in TT-1 due to the potential risk of significant damage to in-vessel components. To study the RE behavior and analyze its characteristics, the LaBr<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>(Ce) detector was employed for measuring hard X-ray emissions in TT-1. In this study, we first characterized the LaBr<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>(Ce) detector in the laboratory and then performed hard X-ray spectroscopy in TT-1. Calibration sources, including ¹³³Ba, ¹³⁷Cs, ²²Na, and ⁶⁰Co, with energies up to 1.33 MeV, were used in the laboratory. The detector was calibrated using biased high voltage of -1000 V. It was found to have an energy resolution of approximately 6.2% at an energy of 0.662 MeV. After calibration, the detector was installed at TT-1 to measure hard X-ray. We analyze the hard X-ray emission from discharge #2183 during a selected time interval. It is found that the high-energy hard X-ray emissions reach up to approximately 500 keV. Assuming a simple Maxwellian distribution of the RE population, their temperature is estimated to be <span><math><mrow><mn>224</mn><mo>±</mo><mn>5</mn></mrow></math></span> keV. These findings confirm the presence of high-energy runaway electrons during TT-1’s plasma discharges. However, to accurately derive the runaway electron energy spectrum from the hard X-ray energy spectrum, the unfolding technique is required. In future work, we plan to apply the unfolding method, conduct numerical simulations on the physics of runaway electrons, and employ Monte Carlo simulations on the hard X-ray emissions.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112346"},"PeriodicalIF":2.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664154","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":"Monte Carlo source verification of Elekta Synergy for pMLC collimated electron beams","authors":"D. van Eeden, F.C.P. du Plessis","doi":"10.1016/j.radphyschem.2024.112359","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112359","url":null,"abstract":"In previous works, an electron beam source was developed that models its energy spectrum with a Lévy distribution. This source is used in BEAMnrc Monte Carlo simulation. It was benchmarked against water tank measurements for electrons delivered through an applicator collimation system, and it was found to agree with 2%/2 mm. This study uses this electron source further by investigating its ability to simulate electrons collimated by the photon multi-leaf collimators for MERT applications. Simulated and Gafchromic EBT3 depth dose and profile data were compared.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"76 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665598","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":"Green synthesis and thermoluminescent response of ZnO particles using Mimosa tenuiflora bark extract","authors":"Milena Lima Guimarães, Ricardo Ferrari Ferraz, Raquel Aline Pessoa Oliveira, Helinando Pequeno de Oliveira","doi":"10.1016/j.radphyschem.2024.112350","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112350","url":null,"abstract":"The continuous growth of industrial activity has led to environmental degradation, highlighting the need for alternative and environmentally friendly chemical methods for creating technological solutions for society. Green synthesis offers a promising approach for the large-scale production of materials for several applications. Herein, the synthesis of zinc oxide (ZnO) particles is proposed by a green route using <ce:italic>Mimosa tenuiflora</ce:italic> bark extract for evaluation of the thermoluminescent (TL) response of the produced material at different calcination temperatures (400 °C, 700 °C, and 1000 °C). The resulting material was evaluated from X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray fluorescence (XRF), UV–visible (UV–vis) spectroscopy, and thermoluminescence (TL) measurements. The ZnO powder exhibited a single-phase wurtzite ZnO with a hexagonal unit cell crystal system with the crystallite size affected by the calcination temperature. ZnO/Teflon® pellets were prepared to assess the TL response under irradiation with a<ce:sup loc=\"post\">90</ce:sup>Sr beta radiation source between 10 Gy and 300 Gy. The samples calcined at 400 and 700 °C did not show a TL response, while the samples calcined at 1000 °C exhibited an intense TL signal, with a prominent peak at 308 °C and a linear growth in the range of 10–300 Gy, reinforcing the perspectives for use of ZnO-1000/Teflon® pellets in TL dosimetry.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"140 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665605","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 and radiobiological comparison of TomoTherapy and IMRT plans for prostate cancer","authors":"Amin Pourfarshid, Asghar Mesbahi, Mohammad Mohammadzadeh, Mikaeil Molazadeh, Ahad Zeinali","doi":"10.1016/j.radphyschem.2024.112356","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112356","url":null,"abstract":"The purpose of this study was to investigate the dosimetric and radiobiological parameters of IMRT and TomoTherapy techniques to determine the best technique for the treatment of prostate cancer. Dynamic IMRT and Helical TomoTherapy (HT) radiotherapy techniques were used for the treatment planning of 10 patients with prostate cancer. Tumor Control Probability (TCP) and Normal Tissue Complication Probability (NTCP) based on Lyman-Kutcher-Burman (LKB) and Relative Seriality (RS) models as radiobiological parameters in addition to the multiple dosimetrics including Equivalent Uniform Dose (EUD), Heterogeneity Index (HI), and Conformity Index (CI) were evaluated. The mean NTCP value based on the LKB model for the IMRT method was higher than that for the HT method by approximately 4.62% for the bladder and 4.89% for the rectum, respectively. Similarly, in the RS model, the average NTCP values for IMRT were approximately 4.14% and 12.78% for the bladder and rectum, higher than the HT. The mean values of the HI and CI indices in IMRT were obtained as 0.06 ± 0.01 and 1.13 ± 0.08, respectively. With the HT technique, the index values were equal to 0.04 ± 0.01 and 1.09 ± 0.05, respectively. The mean doses to the rectum and right/left femoral heads were 13.19%, 11.32%, and 10.90% higher in IMRT than in HT, respectively. However, the mean dose to the bladder tissue was 17.13% higher in HT than in IMRT. Our study demonstrated that HT plans were superior to IMRT plans in terms of estimated NTCP using radiobiological models (LKB and RS) for healthily tissues. Except for the higher treatment duration, while having a desired and uniform dose distribution to the tumor, the TomoTherapy technique leads to preservation of healthy organs.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"225 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of Ce3+ ions on the optical, and radiation shielding properties in Ba–Sn borophosphate glass","authors":"A. Paul Dhinakaran, P. Vinothkumar, S. Praveenkumar, Manoj Mohapatra","doi":"10.1016/j.radphyschem.2024.112357","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112357","url":null,"abstract":"This study aims to investigate the structural, optical, and mechanical properties of Ce<ce:sup loc=\"post\">3+</ce:sup> doped Barium Tin Borophosphate glass for potential applications in nuclear radiation shielding. The Ce<ce:sup loc=\"post\">3+</ce:sup> Doped Barium Tin Borophosphate glass (50B<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>+20 P<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">5</ce:inf>+10TiO<ce:inf loc=\"post\">2</ce:inf>+6SrCO<ce:inf loc=\"post\">3</ce:inf>+4SnO+ 4BaF<ce:inf loc=\"post\">2</ce:inf>+5BaCO<ce:inf loc=\"post\">3</ce:inf>+1Ce<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>) was produced according to earlier research, melt quenching method. The amorphous nature of Ce<ce:sup loc=\"post\">3+</ce:sup> Doped Barium Tin Borophosphate glass was verified by powder X-ray diffraction investigation. The Ce<ce:sup loc=\"post\">3+</ce:sup> Doped Barium Tin Borophosphate glass's functional groups were determined using Fourier transform-RAMAN and Fourier transform infrared spectroscopy. Using Ultraviolet-Visible spectroscopy the Ce<ce:sup loc=\"post\">3+</ce:sup> Doped Barium Tin Borophosphate glass was examined. These properties included its optical band gap, extinction coefficient, optical conductivity, and refractive index. Using EDAX and SEM analyses, the chemical compositions and surface morphology of the Ce<ce:sup loc=\"post\">3+</ce:sup> Doped Barium Tin Borophosphate glass were examined. Ce<ce:sup loc=\"post\">3+</ce:sup> doped barium tin Borophosphate glass was studied in terms of its excitation and emission spectra using the photoluminescence technique. The glass's CIE coordinates were also looked at. Additionally, the mass attenuation coefficient, half-value layer, mean free path, tenth value layer, and EABF were studied concerning the glass's gamma-ray shielding qualities using the Phy-X software.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"70 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665599","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":"Radiation driven synthesis of MnSe nanoparticles with dual luminescence and magnetic characteristics and its role in photocatalytic reactions","authors":"Tushar Kanti Das,&nbsp;Sudip Karmakar,&nbsp;Rajib Mondal,&nbsp;Aparna Datta,&nbsp;Abhijit Saha","doi":"10.1016/j.radphyschem.2024.112358","DOIUrl":"10.1016/j.radphyschem.2024.112358","url":null,"abstract":"<div><div>Many biomedical applications can greatly benefit from the combination of photoluminescence and magnetic properties of non-toxic manganese-based nanomaterials and thus, it demands for synthesizing such materials in an aqueous environment. The present work reports aqueous synthesis of starch-capped manganese selenide (MnSe) nanoparticles (NPs) through a steady-state gamma irradiation route under ambient pressure and room temperature. As radiolysis is considered as the cleanest method among available chemical approaches, we preferred to employ this technique and endeavored to establish optimal conditions of such synthesis. The as-produced MnSe nanocrystals demonstrated strong photoluminescence with a quantum yield of ca. 32% and co-existence of paramagnetic with antiferromagnetic behavior. To look into possible light-induced reactions with aromatic molecules, the effectiveness of synthesized particles on photo-induced degradation of dyes of similar structure was investigated. The proposed strategy may pave the way for synthesizing magneto-fluorescent nanoparticles in aqueous medium, which may find immense scope in nano-photonics and nano-biotechnology including biological assays, labelling and imaging.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112358"},"PeriodicalIF":2.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592683","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":"Skin dose estimation of Multani Mitti (Fuller's earth) using Geant4 Monte Carlo simulations","authors":"Khizar Hayat Satti, Muhammad Tariq Siddique, Shakeel Ur Rehman, Muhammad Dilband","doi":"10.1016/j.radphyschem.2024.112353","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112353","url":null,"abstract":"This study is aimed to estimate the skin dose due to presence of natural radionuclides in the Multani Mitti (MM, fuller's earth). The activity concentration of natural radionuclides is measured by using Canberra's HPGe detector model GC3020. The average activity concentration levels of <ce:sup loc=\"post\">238</ce:sup>U, <ce:sup loc=\"post\">232</ce:sup>Th and <ce:sup loc=\"post\">40</ce:sup>K are found to be 47, 71 and 748 Bq kg<ce:sup loc=\"post\">−1</ce:sup> respectively which are higher than corresponding world's median values 30, 35 and 400 Bq kg<ce:sup loc=\"post\">−1</ce:sup> as reported in Unscear 2000. Geant4 MC simulation is used to estimate skin doses arising due to application of MM on the skin. The decay chains for <ce:sup loc=\"post\">238</ce:sup>U and <ce:sup loc=\"post\">232</ce:sup>Th are simulated using Radioactive Decay Module (RDM) available in the Geant4, which automatically accounts for the all members of the decay chain and all types of radioactive emissions. The skin dose conversion factors for natural radionuclides in MM for <ce:sup loc=\"post\">238</ce:sup>U,<ce:sup loc=\"post\">232</ce:sup>Th and <ce:sup loc=\"post\">40</ce:sup>K are found to be 0.5, 0.5 and 330 mGy MBq<ce:sup loc=\"post\">−1</ce:sup> hr<ce:sup loc=\"post\">−1</ce:sup>. The main contribution to skin dose comes from <ce:sup loc=\"post\">40</ce:sup>K. The radiological health risks to miners and workers are evaluated by measuring radium equivalent activity, radiation hazard indices, annual absorbed dose rate, annual gonadal effective dose equivalent and annual effective dose equivalent. The values of annual absorbed dose rate, gonadal dose and annual effective dose equivalent are found higher than world's median values in the soil. Therefore, miners and workers dealing with MM are vulnerable to potential negative health effects of radiation exposure.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"62 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced physical, optical and radiation shielding properties of tungsten modified potassium boro-tellurite glass systems: Theoretical approach","authors":"Suleman M. Ngaram, Suhairul Hashim, Mohamad Syazwan Mohd Sanusi, Abdullahi Ibrahim","doi":"10.1016/j.radphyschem.2024.112355","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2024.112355","url":null,"abstract":"Boro-tellurite glasses in the (70-x) B<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>–5TeO<ce:inf loc=\"post\">2</ce:inf>–10Bi<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>–10SrCO<ce:inf loc=\"post\">3</ce:inf>–5K<ce:inf loc=\"post\">2</ce:inf>CO<ce:inf loc=\"post\">3</ce:inf>-xWO<ce:inf loc=\"post\">3</ce:inf> system, with varying WO<ce:inf loc=\"post\">3</ce:inf> content (x = 0, 1, 2, 3, 4 and 5 mol %), were synthesized using the melt quenching technique. The effectiveness of radiation protection was assessed using the Phy-X/PSD tool across a broad energy spectrum ranging from 15 keV to 15 MeV. The results indicated that the mass attenuation coefficient (MAC) values increased proportionally with the concentration of WO₃ in the glass samples. At approximately 0.015 MeV, the MAC reached its maximum for all glass compositions, ranging from 45.822 g cm<ce:sup loc=\"post\">−2</ce:sup> for BW1 to 51.258 g cm<ce:sup loc=\"post\">−2</ce:sup> for BW5. However, beyond 15 keV, a notable decrease in MAC values was observed, primarily attributed to the dominance of photoelectric interactions at lower energy levels. Furthermore, the effective atomic number (Z<ce:inf loc=\"post\">eff</ce:inf>) ranged from 64.08 to 65.44, with a peak observed at 15 keV. Beyond this energy, the Z<ce:inf loc=\"post\">eff</ce:inf> values for all the produced glass samples showed a marked decrease as the energy of gamma photons increased, mirroring the trend observed in the MAC values. Conversely, the half-value layer (HVL) and mean free path (MFP) exhibited a consistent reduction. A comparative analysis of the MFP of the glass samples with other shielding materials demonstrated that the BW5 glass exhibited superior performance at 1.50 MeV. These findings highlight the potential of the BW5 glass sample for radiation shielding applications, which has the highest WO₃ content and density, positioning it as a promising material for future radiation protection technologies.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"13 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665601","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":"Theoretical investigation of dosimeter accuracy for linear energy transfer measurements in proton therapy: A comparative study of stopping power ratios","authors":"Johnpaul Mbagwu","doi":"10.1016/j.radphyschem.2024.112354","DOIUrl":"10.1016/j.radphyschem.2024.112354","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Background&lt;/h3&gt;&lt;div&gt;Accurate measurement of linear energy transfer (LET) is crucial in medical physics, particularly for proton therapy dosimetry. High atomic-number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) materials such as BaFBr and low-&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; materials such as &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and water are commonly used in dosimeters.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Purpose&lt;/h3&gt;&lt;div&gt;To evaluate the feasibility and accuracy of the use of various dosimetry materials (water, air, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, aluminum (Al), BaFBr, and oxygen) for measuring LET by comparing their stopping power (ratios) via the Bethe-Bloch theory and semiempirical models.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Methods&lt;/h3&gt;&lt;div&gt;Stopping power ratios were calculated via the PSTAR database for proton energies ranging from 0.01 MeV to 10,000 MeV. The Bethe-Bloch theory with density and shell corrections was used for high-energy protons, whereas a semiempirical model was applied for low-energy protons. Calculations validation involved comparing the computed stopping powers SRIM-2008 and PSTAR for materials such as water, aluminum, air, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, BaFBr, and oxygen.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Results&lt;/h3&gt;&lt;div&gt;The stopping power water-to-air ratio remains stable, while the &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;-to-water and air-to-water ratios highlight their differing attenuation properties. The BaFBr-to-water ratio shows significant material-dependent differences, and the water-to-&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; ratio is particularly relevant for proton therapy dosimetry calculations in medical physics. These results demonstrate consistency across materials but do not inherently confirm the accuracy of LET measurements. However, a comparison of theoretical models with computed stopping powers SRIM-2008 and PSTAR showed strong agreement, particularly for high-energy protons where the Bethe-Bloch theory was applied, suggesting that the models reliably predict stopping power at these energy levels.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Conclusions&lt;/h3&gt;&lt;div&gt;This study confirms the feasibility of using high-&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; materials such as BaFBr and low-&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; materials such as ","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"227 ","pages":"Article 112354"},"PeriodicalIF":2.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}