Applied Radiation and Isotopes最新文献

{"title":"Small field commissioning and verification for the uRT-TPOIS radiotherapy treatment planning system","authors":"Yongguang Liang ,&nbsp;Jingru Yang ,&nbsp;Lang Yu ,&nbsp;Shumeng He ,&nbsp;Yanfang Liu ,&nbsp;Zhi Shi ,&nbsp;Zijie Mo ,&nbsp;Libin Wen ,&nbsp;Shaoqiang Ye ,&nbsp;Bo Yang ,&nbsp;Jie Qiu","doi":"10.1016/j.apradiso.2025.111982","DOIUrl":"10.1016/j.apradiso.2025.111982","url":null,"abstract":"<div><h3>Purpose</h3><div>Stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT) plans involve high doses and small fields. Standard commissioning procedures typically do not prioritize small fields, which is why the commission parameters of small field models require a comprehensive and precise verification process to ensure accurate dose calculation for SRS/SBRT plans.</div></div><div><h3>Methods</h3><div>The study employed various methods, including dose validation tests in a water tank with both regular and irregular small fields. The StereoPHAN and SRS MapCHECK were utilized to assess the modelling accuracy of collapse cone convolution (CC) and Monte Carlo (MC) algorithms for both point and planar doses of the small field plans. Additionally, pre-treatment approval of SRS/SBRT plans based on Electronic Portal Imaging Device (EPID) equipped on the machine was conducted. To enhance realism, 19 clinical SRS/SBRT plans were measured and analyzed for their point and planar doses. In addition, a special 27-target plan was measured using ‘gold standard’ film and compared with the calculations based on parameters from the small field commissioning procedures.</div></div><div><h3>Results</h3><div>The validation tests conducted in the water tank proved to be reliable and accurate for both regular and irregular small fields. The results indicated that the average error of point dose decreased from 2.29 % with parameters based on standard commissioning procedures to 0.64 % with parameters based on small field commissioning procedures. Furthermore, planar doses acquisition included high-dose and non-high-dose planes, resulting in an increase in the average gamma passing rate from 93.15 % to 99.90 %. The gamma passing rates of EPID pre-treatment verifications exceeded 99 % at a criteria of 2mm2 %. These findings demonstrate the effectiveness of small field commissioning procedures in improving the accuracy of dose calculations for SRS/SBRT plans.</div></div><div><h3>Conclusion</h3><div>This study marks the first time that small field commissions and verifications of CC and MC algorithms in uRT-TPOIS, along with uRT-linac 506c, were conducted. The reliability and accuracy of the calculation algorithms for small field commissions were verified through the comparisons between measurements and calculations. The results showed that both CC and MC algorithms' small field parameters met the clinical requirements with minimal deviations (lower than 2 %) between measurements and calculations. Additionally, EPID was found to be an effective quality assurance tool for SRS/SBRT plans.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111982"},"PeriodicalIF":1.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preliminary study of 3D dose distribution evaluation in neutron capture therapy using a PVA-GTA-I radiochromic gel dosimeter","authors":"S. Hayashi ,&nbsp;R. Narita ,&nbsp;Y. Sakurai ,&nbsp;K. Fujino ,&nbsp;R. Kurihara ,&nbsp;S. Ikeda ,&nbsp;K. Ono ,&nbsp;G. Wakabayashi","doi":"10.1016/j.apradiso.2025.112008","DOIUrl":"10.1016/j.apradiso.2025.112008","url":null,"abstract":"<div><div>Boron neutron capture therapy (BNCT) is a promising cancer treatment method that utilizes the nuclear reaction between ¹⁰B and thermal neutrons. Three-dimensional (3D) gel dosimeters are gaining attention for their potential to assess 3D dose distributions in BNCT. In this study, a PVA-GTA-I (polyvinyl alcohol crosslinked by glutaraldehyde, and iodide) radiochromic gel dosimeter, which develops a red color due to complex formation between PVA and iodide, was investigated. A PVA-GTA-I gel dosimeter, enhanced with neutron sensitizers ¹⁰B and ⁶Li, was irradiated with neutrons from a nuclear reactor. As a preliminary experiment for future evaluation of 3D dose distribution, we assessed a pseudo-one-dimensional depth dose distribution by measuring absorbance changes in a system of small gel dosimeters. The results showed that the PVA-GTA-I gel dosimeter could detect increased doses resulting from neutron capture reactions when neutron sensitizers were present. The shape of the pseudo-one-dimensional depth-dose distribution correlated well with a simple simulation. These findings suggest the potential for future 3D dose distribution measurements using large gel dosimeters and 3D optical computed tomography devices.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 112008"},"PeriodicalIF":1.6,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Double-filter monitor for simultaneous measurement of Radon and its progeny","authors":"Rosaline Mishra ,&nbsp;R. Prajith ,&nbsp;R.P. Rout ,&nbsp;S. Jalaluddin ,&nbsp;A. Khan ,&nbsp;B.K. Sapra","doi":"10.1016/j.apradiso.2025.112006","DOIUrl":"10.1016/j.apradiso.2025.112006","url":null,"abstract":"<div><div>For simultaneous measurement of radon and its progeny, double filter monitor based on Direct progeny sensors (DRPS) was developed. DRPS is an absorber mounted LR115 detector which measures the progeny concentration. Double filter consisted of two filters, inlet and exit filter, which were utilised in the monitor for progeny atom deposition such that the ambient progeny atoms get deposited on the inlet filter and the progeny formed due to decay of radon sampled inside the delay volume get deposited on the exit filter. DRPS facing the inlet filter would detect the alpha particles emitted during decay of progeny on inlet filter and that will correspond to ambient progeny concentration. Similarly DRPS placed facing the exit filter will detect the alpha particles emitted during the decay of progeny on exit filter, which is related to ambient radon concentration. Thus the system has two filters and two progeny sensors. The loss of progeny atoms formed during the decay of ingressed radon inside the delay chamber may be lost due to plate-out on the walls of the delay chamber. The plate-out loss is characterised by diffusion parameter. Theoretical calculations of transit time of progeny atoms in the delay volume at different flow rates were also used to study the effect of volume of the chamber at different flow rates. The system was calibrated in known activities of radon and its progeny and the calibration factors were measured. Additional advantage of the system is that in-situ equilibrium factor can be measured.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 112006"},"PeriodicalIF":1.6,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interlaboratory comparison for ensuring validity of radiochemical analysis results of NPP decommissioning radioactive wastes","authors":"Seungsu Shin,&nbsp;Sojung Shim,&nbsp;Chang Heon Lee,&nbsp;Young-Ku Choi","doi":"10.1016/j.apradiso.2025.112005","DOIUrl":"10.1016/j.apradiso.2025.112005","url":null,"abstract":"<div><div>A mobile radiochemical analysis laboratory (MIRACLE) was developed to quickly characterize and classify the radioactive wastes produced during the decommissioning of nuclear power plants by their radioactivity level. To ensure the accuracy of the results produced by MIRACLE, a comparative test was conducted involving three domestic laboratories. For this purpose, one radioactive liquid reference material made from SUS 304 (SUS 304-liquid-RM), simulating the acid dissolution solution of stainless steel 304, and two certified reference materials (CRM) consisting of bead-type concrete (C-CRM)and soil (S-CRM), were used.</div><div>The accuracy of the analyses for ⁶⁰Co, ¹³⁴Cs, ¹³⁷Cs, and ⁹⁰Sr, as standard radiation sources in the SUS 304-liquid-RM, C-CRM, and S-CRM, was evaluated using the En-score method as specified in ISO 13528. Results were deemed satisfactory if the En-score fell within the range of −1.0 &lt; En &lt; 1.0.</div><div>For ⁶⁰Co and ¹³⁷Cs in the SUS 304-liquid-RM, all participating labs reported En-scores within the range of −1.0 &lt; En &lt; 1.0, while for ¹³⁴Cs, the En-score was greater than 1. Notably, only lab-A reported an En-score of 0.2 for ⁹⁰Sr, a beta emitter.</div><div>For ⁶⁰Co and ¹³⁷Cs in the C-CRM, only lab-B reported En-scores within the range of 0 &lt; En &lt; 1 for ⁶⁰Co and ¹³⁷Cs across the entire radioactivity range.</div><div>Finally, for ⁶⁰Co and ¹³⁷Cs in the S-CRM, all participating labs reported satisfactory En-scores across the full range of radioactivity.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 112005"},"PeriodicalIF":1.6,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of dose component discrimination method using micelle gel dosimeters for quality assurance in boron neutron capture therapy","authors":"Ryosuke Narita ,&nbsp;Shin-ichiro Hayashi ,&nbsp;Yoshinori Sakurai","doi":"10.1016/j.apradiso.2025.112007","DOIUrl":"10.1016/j.apradiso.2025.112007","url":null,"abstract":"<div><div>As a new tool for quality assurance in boron neutron capture therapy, we focused on gel dosimeters that can estimate three-dimensional dose distribution. To establish a method that combines multiple types of radiochromic gel dosimeters sensitive to specific dose components for the discrimination of the dose components, the neutron and gamma-ray responses of leucocrystal violet micelle gel dosimeters were characterized. For the estimation of boron or nitrogen dose components, dosimeters containing boric acid or urea as a sensitizer were prepared, while for hydrogen dose components, light-water-based and heavy-water-based dosimeters were prepared. For investigating the neutron and gamma-ray response characteristics, the Heavy Water Neutron Irradiation Facility installed at the Kyoto University Reactor and the Co-60 gamma-ray irradiation facility were used. Based on the characterization results, a dose component discrimination method using four different types of gel dosimeter compositions was proposed.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 112007"},"PeriodicalIF":1.6,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of the 10B(d,n)11C reaction cross-section in the energy range of 0.05–0.57 MeV in inverse kinematics","authors":"P.S. Prusachenko ,&nbsp;A.F. Gurbich,&nbsp;T.L. Bobrovskiy,&nbsp;M.V. Bokhovko","doi":"10.1016/j.apradiso.2025.111999","DOIUrl":"10.1016/j.apradiso.2025.111999","url":null,"abstract":"<div><div>The excitation function for the ¹⁰B(d,n)¹¹C reaction was measured in the energy range of 0.05–0.57 MeV. The measurements were performed using the inverse kinematic reaction ²H(¹⁰B,n)¹¹C to reduce the background specific to the experiments with deuteron beams and to prevent the leakage of ¹¹C recoil nuclei from the target. Two scintillation detectors based on NaI(Tl) crystals operating in coincidence mode were used to detect γ-rays with an energy of 0.511 MeV produced during the β⁺ decay of ¹¹C. The cross-section of the ²H(¹⁰B,n)¹¹C reaction was obtained from the analysis of the decay curve of ¹¹C after irradiation taking into account the detection efficiency of the system, the concentration of deuterium atoms in the target and the stopping power for boron ions. Then the cross-section of the ¹⁰B(d,n)¹¹C reaction was calculated using known kinematic equations. The obtained cross-section data are generally in agreement with the data previously reported for deuteron energies less than 0.2 MeV and are inconsistent with the data corresponding to energies greater than 0.5 MeV. The experimental data in the energy range of 0.2–0.5 MeV were obtained for the first time.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111999"},"PeriodicalIF":1.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the role of SiPM number on energy resolution in radiation detection using bismuth germanate crystals","authors":"Emre Iren ,&nbsp;Taylan Yetkin ,&nbsp;Onur Bugra Kolcu ,&nbsp;Ferhat Ozok ,&nbsp;Mustafa Nizamettin Erduran","doi":"10.1016/j.apradiso.2025.111958","DOIUrl":"10.1016/j.apradiso.2025.111958","url":null,"abstract":"<div><div>In this study, we present a simple statistical model to show the relationship between the number of Silicon Photomultipliers (SiPMs) and the energy resolution of the detector. We used bismuth germanate (BGO) crystals in combination with varying numbers of SiPMs to examine the effect of photodetector count on energy resolution. We compared our results with Photomultiplier Tube-based measurements to determine the advantage of SiPMs in terms of energy resolution. We also performed a simulation study with the GEANT4 simulation package to investigate the energy resolution that can be achieved under ideal conditions by using a higher number of SiPMs. The experimental measurements showed that for a photopeak energy of 511 keV, an energy resolution of 29.9% was achieved using five SiPMs covering only 3.25% of the scintillator area, whereas a Photomultiplier Tube (PMT) covering 37% of the same area resulted in an energy resolution of about 23.4%. As a result of the simulation study, it is predicted that the energy resolution can be achieved up to 14.8% for a photopeak energy of 511 keV by using 21 symmetrically distributed SiPM.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111958"},"PeriodicalIF":1.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel insights into GaN-HEMT behaviour under multi-particle irradiation","authors":"Rijin N.T. ,&nbsp;Dinesh Kumar Sharma ,&nbsp;M.M. Musthafa ,&nbsp;Midhun C.V.","doi":"10.1016/j.apradiso.2025.111971","DOIUrl":"10.1016/j.apradiso.2025.111971","url":null,"abstract":"<div><div>This study investigates the effects of photon, neutron, and <span><math><mi>α</mi></math></span>-irradiation on the electrical characteristics of a 30<!--> <!-->A GaN-HEMT (Gallium Nitride High Electron Mobility Transistor). Photon irradiation leads to a noticeable decrease in the drain current (<span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>D</mi></mrow></msub></math></span>) across all gate voltages, with nonlinear deviations increasing with gate voltage. This phenomenon is attributed to photon-induced <span><math><mi>δ</mi></math></span>-rays, which generate crystal defects and alter the band structure. Neutron irradiation primarily causes a significant shift in the saturation region of the <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>D</mi></mrow></msub></math></span>-<span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>D</mi></mrow></msub></math></span> characteristics, highlighting unique interactions through neutron capture reactions and scattering events. <span><math><mi>α</mi></math></span>-particles induce combined atomic, nuclear, and <span><math><mi>δ</mi></math></span>-ray effects, along with heating. The lack of significant shifts in knee voltage across different irradiations indicates that damage primarily affects the crystal lattice and electron transport mechanisms without altering fundamental operational thresholds. A quantum mechanical methodology is devised to elucidate the physics underlying radiation stress measurements, focusing on displacement damage, radiation-induced transmutation doping effects, and the significance of radiation-induced reactions within the device.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111971"},"PeriodicalIF":1.6,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radon and Thoron exhalation rates in soil near coal mines in Shahdol, Madhya Pradesh","authors":"Garima Malik ,&nbsp;Rajat Parkash ,&nbsp;Meenakshi Bhutani ,&nbsp;Babita Hooda ,&nbsp;Amanjeet Panghal ,&nbsp;Pratap Singh Malik ,&nbsp;R.P. Chauhan ,&nbsp;Rekha Dhiman ,&nbsp;Sawan Chaudhary ,&nbsp;Parmjeet Kaur","doi":"10.1016/j.apradiso.2025.111994","DOIUrl":"10.1016/j.apradiso.2025.111994","url":null,"abstract":"<div><div>The purpose of this study was to assess the amounts of radon and thoron gas emissions from soil in the vicinity of coal mines within the Shahdol region of Madhya Pradesh, which is in India. We collected and analyzed 50 distinct soil samples to carry out the study. The SMART RnDuo device (produced by AQTEK SYSTEMS) was used to measure the thoron surface exhalation rates (²²⁰Rn) and the radon mass exhalation rates (²²²Rn). This device utilized a mass accumulation chamber integrated with a detection cell coated with scintillation material to measure the exhalation rates. ²²²Rn varies from (3.81–32.79) mBq kg⁻¹ h⁻¹with a mean of 14.62 mBq kg⁻¹ h⁻¹. ²²⁰Rn varies from (1.50–1002.58) Bqm⁻²h⁻¹ with an average of 500.49 Bqm⁻²h⁻¹. As a result the mean is lower than the average value worldwide. The thoron surface exhalation rate and the radon mass exhalation rate were also shown to be significantly positively correlated. The results demonstrate the safety of using the soil from the research region as a building material.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111994"},"PeriodicalIF":1.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bilayer target for efficient production of 47Sc from proton-induced irradiation","authors":"Luciano Canton ,&nbsp;Francesca Barbaro ,&nbsp;Yuliia Lashko ,&nbsp;Lucia De Dominicis ,&nbsp;Liliana Mou ,&nbsp;Gaia Pupillo","doi":"10.1016/j.apradiso.2025.111957","DOIUrl":"10.1016/j.apradiso.2025.111957","url":null,"abstract":"<div><div>The production of ⁴⁷Sc for nuclear medicine applications is a complex challenge requiring innovative approaches to enhance yield and purity. In this study, we introduce a bilayer-target strategy using natural vanadium (<span><math><msup><mrow></mrow><mrow><mtext>nat</mtext></mrow></msup></math></span>V) and enriched ⁵⁰Ti irradiated by intermediate-energy proton beams. This novel methodology significantly advances the field, offering improved production efficiency without compromising radionuclidic purity, crucial for theranostic applications in precision medicine.</div></div>","PeriodicalId":8096,"journal":{"name":"Applied Radiation and Isotopes","volume":"225 ","pages":"Article 111957"},"PeriodicalIF":1.6,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}