Radiation Measurements最新文献_第6页

Performance evaluation in multi-radionuclide distribution measurement of a new SPECT system based on a thick CZT crystal 基于厚CZT晶体的新型SPECT多放射性核素分布测量系统的性能评价

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-12-26 DOI: 10.1016/j.radmeas.2025.107602

Feng Tian , Changran Geng , Lijun Tang , Xiaobin Tang

{"title":"Performance evaluation in multi-radionuclide distribution measurement of a new SPECT system based on a thick CZT crystal","authors":"Feng Tian , Changran Geng , Lijun Tang , Xiaobin Tang","doi":"10.1016/j.radmeas.2025.107602","DOIUrl":"10.1016/j.radmeas.2025.107602","url":null,"abstract":"<div><div>Single photon emission computed tomography (SPECT) is the commonly used imaging modality in clinical nuclear medicine for disease diagnosis. However, traditional SPECT systems have several disadvantages when monitoring the distribution of radiopharmaceuticals labeled various radionuclides.</div><div>A cadmium zine telluride (CZT) SPECT system based on a 15.00 mm thick, three-dimensional (3D) pixeled CZT crystal is developed. The performance of this CZT-SPECT system in detecting the distribution of different radiopharmaceuticals are analyzed through mouse phantom experiments. The results show that for <sup>99m</sup>Tc (141 keV), <sup>177</sup>Lu (208 keV), and <sup>18</sup>F (511 keV), the energy resolution of the CZT-SPECT system is 2.38 %, 1.94 %, and 1.47 %, respectively. The depth of interaction (DOI) of 141 keV, 208 keV or 511 keV gamma rays emitted by different radionuclides in the CZT crystal are recorded, and the DOI ranges are approximately 2.17–5.85 mm, 2.00–9.00 mm, and 1.00–11.00 mm, respectively. Both qualitative and quantitative results indicate that the CZT-SPECT system can achieve spatial distribution detection and reconstruction, both in case of irradiation with only one and multiple radionuclides. The full width at half maximum (FWHM) of radiation source placed in each kidney reconstructed is almost less than 5.00 mm for these radionuclides.</div><div>Due to the excellent energy resolution and the large size of the 3D-CZT crystal, the CZT-SPECT system developed can effectively measure the <em>in-vivo</em> distribution of various diagnostic and therapeutic radiopharmaceuticals labeled with different radionuclides. The results of this study can also provide technical support for the future development of more radiopharmaceuticals.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"191 ","pages":"Article 107602"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884062","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}

引用次数: 0

Optimized quantitative indirect neutron radiography method for 2D non-primary radiation measurement in BNCT 优化定量间接中子放射成像方法用于BNCT二维非一次辐射测量

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-12-18 DOI: 10.1016/j.radmeas.2025.107599

Jialong Yang , Xingyan Liu , Diyun Shu , Changran Geng , Xiaobin Tang , Yuan-Hao Liu

{"title":"Optimized quantitative indirect neutron radiography method for 2D non-primary radiation measurement in BNCT","authors":"Jialong Yang , Xingyan Liu , Diyun Shu , Changran Geng , Xiaobin Tang , Yuan-Hao Liu","doi":"10.1016/j.radmeas.2025.107599","DOIUrl":"10.1016/j.radmeas.2025.107599","url":null,"abstract":"<div><div>Accurate quantitative measurement of neutron non-primary radiation is crucial for the safe implementation of boron neutron capture therapy (BNCT), yet such measurement faces challenges including large measurement area and strong γ-ray interference. Indirect neutron radiography (INR) offers advantages for large-area measurement and γ resistance, but its application is limited by the low sensitivity of activation detectors and measurement errors from crosstalk. To address these challenges, dysprosium (Dy) was selected as the activation detector to enhance sensitivity, establishing a quantitative calibration relationship between its activity and imaging plate (IP) signals. For signal crosstalk during foil exposure, spatial convolution kernel was constructed using Monte Carlo simulations, and then applied with the Biconjugate Gradient Stabilized (Bi-CGSTAB) algorithm to perform spatial deconvolution of dose deposition on the IP, thereby reconstructing the actual activity of each pixel on the foil. Validation experiments demonstrated significant improvement, and the proportion of data points exceeding 5 % deviation decreased from over 60 % before correction to below 15 % after correction. Applied to clinical BNCT device, it successfully obtained the two-dimensional (2D) distribution of neutron non-primary radiation within 150–550 mm from the radiation field edge. The converted maximum skin absorbed dose rate was 1.26 × 10<sup>−4</sup> Gy/s, located at 150 mm from the radiation field edge and decaying rapidly with increasing distance. This study achieved the quantitative measurement of 2D neutron non-primary radiation distribution in clinical BNCT devices, and provided technical support for comprehensive assessment of radiation risks and optimization of protection design.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"191 ","pages":"Article 107599"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840082","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}

引用次数: 0

Cost-effective on-site dose assessment by a combination of radiochromic film and smartphone 采用放射变色膜和智能手机相结合的具有成本效益的现场剂量评估

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-12-13 DOI: 10.1016/j.radmeas.2025.107593

Hassna Bantan , Hiroshi Yasuda

{"title":"Cost-effective on-site dose assessment by a combination of radiochromic film and smartphone","authors":"Hassna Bantan , Hiroshi Yasuda","doi":"10.1016/j.radmeas.2025.107593","DOIUrl":"10.1016/j.radmeas.2025.107593","url":null,"abstract":"<div><div>To minimize health injuries in mass-casualty nuclear events, personal-level preparedness, including a simple, universal, and cost-effective dosimetry tool, is crucial. In this study, we propose an inexpensive dosimetry system using a radiochromic film, which can immediately detect high-dose radiation exposure by the naked eye, and a portable scanner coupled with a smartphone as a practical tool for radiological emergency preparedness. Small pieces of Gafchromic EBT4 films were irradiated with X-rays (160 kVp, 6.3 mA) at 2.5, 5.0, and 10 Gy (for water) and scanned on an LED light table of a commercially available portable scanner (PictoScanner ApS, Denmark) using four different smartphones: Samsung Galaxy A23 5G SC-56C, Samsung Galaxy Note8, iPhone Xs Max, and iPhone 13 Pro Max. The dose responses of the 8-bit color intensities of the red, green, and blue (RGB) and cyan, magenta, yellow, and black (CMYK) channels were analyzed. Smartphone cameras of the same company exhibited similar response characteristics. Among the seven color channels, the intensity of the cyan channel was the highest and increased with dose. However, the results at 2.5 Gy showed large discrepancies, which could be attributed to the low color intensities. According to the findings, this inexpensive portable dosimetry tool is expected to be effectively applied for on-site emergency dosimetry in relatively high-dose (≥5 Gy) situations. Although this approach requires preparatory actions, such as the pre-distribution of film pieces and the provision of portable scanners, these are practically achievable at a reasonable cost. Further efforts are required to widen the applicable dose range and to develop practical calibration procedures.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"191 ","pages":"Article 107593"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145790521","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}

引用次数: 0

Characterisation of LaCl3(Ce)-based detectors for D-D fusion neutron diagnostic 用于D-D聚变中子诊断的LaCl3（Ce）基探测器的表征

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-12-19 DOI: 10.1016/j.radmeas.2025.107600

D.S. Fridrikhsen , S.Yu. Obudovsky , T.M. Kormilitsyn , A.V. Pankratenko , Yu.A. Kashchuk , N.N. Moiseev

引用次数: 0

Evaluating SMD resistors in electronic devices as accident dosimeters using red thermoluminescence 用红色热释光评价电子器件中SMD电阻器作为事故剂量计

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-10-27 DOI: 10.1016/j.radmeas.2025.107548

Michael Discher , Céline Bassinet , Hyoungtaek Kim

{"title":"Evaluating SMD resistors in electronic devices as accident dosimeters using red thermoluminescence","authors":"Michael Discher , Céline Bassinet , Hyoungtaek Kim","doi":"10.1016/j.radmeas.2025.107548","DOIUrl":"10.1016/j.radmeas.2025.107548","url":null,"abstract":"<div><div>Traditional protocols utilizing optically stimulated luminescence (OSL) and thermoluminescence (TL) of surface-mounted devices (SMDs) for retrospective dosimetry have demonstrated promising results, but limitations in sensitivity, especially for a limited number of SMD components, and small sample sizes, have prompted the exploration of alternative methods. The red thermoluminescence (RTL) protocol has emerged as a promising alternative, taking advantage of the strong TL emission of SMD components in the near-infrared spectral range.</div><div>The present study investigates the dosimetric performance of red thermoluminescence (TL) emission from surface-mounted devices (SMDs) and its potential for use in accident dosimetry. Key characteristics, such as intrinsic zero-dose signal, signal reproducibility, dose-response relationship, signal stability, and a dose recovery test, were systematically analysed. An irradiation experiment was conducted in which SMDs were exposed to 6 MV X-rays using LINAC, and subsequent dose reconstruction was carried out employing the RTL protocol. The experiments demonstrated that a new RTL protocol yields promising signal intensities, and successful dose reconstruction was achieved even after delayed readout, with fading corrections applied. Dose estimates obtained from single SMD resistors, both reference components and those extracted from a smartwatch, showed good agreement with reference dosimeters, with overestimations between 5 % and 24 %. These findings confirm that the RTL method includes sufficient sensitivity and the ability to analyse very limited sample quantities, particularly in scenarios where signal sensitivity is critical.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107548"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145398501","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}

引用次数: 0

Advanced Monte Carlo simulation as a practical solution for mixed-field dosimetry 先进的蒙特卡罗模拟作为混合场剂量测定的实用解决方案

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-11-11 DOI: 10.1016/j.radmeas.2025.107556

Junyoung Lee , Sangmin Lee , Jongyul Kim , Jinhwan Kim , Byung-gun Park , Young Soo Han , Jeonghun Oh , Sung-Joon Ye

{"title":"Advanced Monte Carlo simulation as a practical solution for mixed-field dosimetry","authors":"Junyoung Lee , Sangmin Lee , Jongyul Kim , Jinhwan Kim , Byung-gun Park , Young Soo Han , Jeonghun Oh , Sung-Joon Ye","doi":"10.1016/j.radmeas.2025.107556","DOIUrl":"10.1016/j.radmeas.2025.107556","url":null,"abstract":"<div><div>This work aims to perform a comprehensive characterization of the mixed neutron and photon fields at the Ex-core Neutron Facility (ENF) of the HANARO reactor by complementing Monte Carlo (MC) simulations with selected experiments. A full-scope MCNP 6.3 model of the reactor–beamline system, augmented with NJOY + NCrystal coherent-elastic libraries for silicon and bismuth, was used to transport neutrons from core to beam port. Activation-induced γ-rays were evaluated by coupling the resulting particle phase-space data at the beam port with PHITS/DCHAIN. Westcott fluence rate, the thermal neutron fluence standardized to a 2200 m/s reference under 1/v cross-sectional assumption, and photon dose were measured at 20 MW<sub>th</sub> condition using a cadmium-shielded 6 × 6 LiF TLD-100/TLD-700 array and gold-foil activation; statistical and systematic uncertainties were propagated. The calculated Westcott fluence rate agreed with TLD and gold activation benchmarks within their combined uncertainties. Incorporation of Bragg scattering effects increased the predicted thermal-neutron fluence rate at the port by about 150 %, suggesting the significance of crystal effects in beam filters. TLD Type A uncertainty was halved through the use of elemental-correction coefficients. Remaining differences in photon dose were predominantly attributed to short-lived γ-rays from cadmium activation, which were effectively simulated by the coupled MCNP–PHITS method. These results show that well-validated MC simulations can supply detailed energy, angular, and spatial data in situations where it is not practical to make direct measurements, providing a robust and cost-effective basis for mixed-field dosimetry and related neutron-beam applications.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107556"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518274","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}

引用次数: 0

Defect-type radiophotoluminescence properties of sodium fluoride for dosimetry 氟化钠剂量学缺陷型辐射光致发光特性研究

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-10-30 DOI: 10.1016/j.radmeas.2025.107550

Takumi Kato, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida

{"title":"Defect-type radiophotoluminescence properties of sodium fluoride for dosimetry","authors":"Takumi Kato, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida","doi":"10.1016/j.radmeas.2025.107550","DOIUrl":"10.1016/j.radmeas.2025.107550","url":null,"abstract":"<div><div>Previous studies have reported luminescence phenomena in sodium fluoride (NaF) following ionizing radiation; however, a comprehensive evaluation of its behavior has been lacking. Therefore, this study explored the potential of NaF as a novel defect-type radiophotoluminescence (RPL) material for dosimetric applications. The aggregations of anion vacancies, F<sub>2</sub>, F<sub>2</sub><sup>+</sup>, and F<sub>3</sub><sup>+</sup> centers, were identified as defect-type RPL centers and characterized by their emission peaks at 650, 930, and 590 nm, respectively. The temporal change at room temperature and thermal process up to 300 °C revealed the build-up phenomenon and fading properties of F<sub>2</sub>, F<sub>2</sub><sup>+</sup>, and F<sub>3</sub><sup>+</sup> centers. Dose response properties immediately after X-ray irradiation showed that F<sub>2</sub> centers dominate at high doses, while F<sub>3</sub><sup>+</sup> centers contribute significantly at lower doses. A linear dose-response relationship was observed from 0.01 to 500 Gy, with a detection limit of 0.009 Gy. These findings position undoped NaF as a promising candidate for practical RPL dosimetry.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107550"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468285","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}

引用次数: 0

Corrigendum to “Absorbed doses in bricks and TL-dosimeters due to anthropogenic and natural environmental radiation sources” [Radiat. Meas. 140 (2021) 106458] 人为和自然环境辐射源在砖和tl剂量计中的吸收剂量的勘误表[辐射]。平均数。140 (2021)106458]

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-11-11 DOI: 10.1016/j.radmeas.2025.107555

Alexander Ulanowski , Mauritius Hiller , Clemens Woda

引用次数: 0

Highly variable light attenuation across a gneiss rock wall in eastern Greenland 格陵兰岛东部片麻岩岩壁上高度可变的光衰减

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-11-20 DOI: 10.1016/j.radmeas.2025.107568

Rachel K. Smedley , Mae Fletcher , Alex Honnold , Aldo Kane , Heidi Sevestre

{"title":"Highly variable light attenuation across a gneiss rock wall in eastern Greenland","authors":"Rachel K. Smedley , Mae Fletcher , Alex Honnold , Aldo Kane , Heidi Sevestre","doi":"10.1016/j.radmeas.2025.107568","DOIUrl":"10.1016/j.radmeas.2025.107568","url":null,"abstract":"<div><div>Exposure ages and erosion rates determined using rock surface luminescence have the potential to revolutionalise Quaternary Science. However, accurately quantifying μ (the light attenuation coefficient) is a significant challenge. Our study shows how variable light attenuation properties (i.e. μ) can be for five samples taken from a small (423 m) elevation range of a near-vertical gneiss rock wall, which we would have expected to have had a shared μ value. The light attenuation properties varied on multiple scales: (i) between samples; (ii) between replicate cores; and (iii) between slices within a core. To avoid the between sample variability, we need to either measure μ directly from the rock cores used to derive the exposure age or erosion rate, or prove that these samples and the sample used to calibrate μ have identical light attenuation properties. To avoid variability between replicate cores observed in samples, it may be more accurate to derive exposure ages or erosion rates using a single core with identical light attenuation properties to the sample used to calibrate μ. Finally, where possible, we should avoid rocks that have hetergeneous mixes of minerals with different opacities (lighter and darker). However, if it is not possible, we should routinely measure red-green-blue (RGB) values to link the presence of any low datapoints in the luminescence depth profiles to overlying lighter-coloured minerals that could have caused light ‘piping’. Our findings further emphasise the detailed consideration required for deriving μ to determine accurate exposure ages and erosion rates.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107568"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615321","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}

引用次数: 0

The development of a DNN-assisted track analysis system for CR-39-based space radiation dosimetry 基于cr -39的空间辐射剂量测定中dnn辅助航迹分析系统的研制

IF 2.2 3区物理与天体物理

Radiation Measurements Pub Date : 2026-01-01 Epub Date: 2025-11-19 DOI: 10.1016/j.radmeas.2025.107565

Jun Hu, Satoshi Kodaira

{"title":"The development of a DNN-assisted track analysis system for CR-39-based space radiation dosimetry","authors":"Jun Hu, Satoshi Kodaira","doi":"10.1016/j.radmeas.2025.107565","DOIUrl":"10.1016/j.radmeas.2025.107565","url":null,"abstract":"<div><div>CR-39 plastic nuclear track detectors are widely used in space radiation dosimetry due to their high sensitivity to charged particles and ability to record linear energy transfer (LET) information. Conventional CR-39 analysis tools can rapidly detect particle tracks in general dosimetry, however, they are not tailored for space radiation applications that require classification of valid tracks and extraction of morphology parameters to estimate LET, motivating the use of an automated approach. In this study, we propose a Deep Neural Network (DNN)-assisted track analysis system based on the Mask Region-based Convolutional Neural Network (R-CNN) framework to automate the detection and segmentation of particle tracks in CR-39 detectors.</div><div>The model was trained using a transfer learning strategy with weights pretrained on the MS COCO dataset and fine-tuned on annotated CR-39 images. It achieved mean average precision (<em>mAP</em>) values of 81.5 % for detection and 81.4 % for segmentation. The system demonstrated robust performance in handling overlapping tracks and significantly improved analysis efficiency, reducing the processing time for a typical sample from several hours to approximately 2 min.</div><div>A comparative analysis with conventional methods showed strong agreement in track counts and absorbed dose estimates, with an average difference of 4.7 % in valid track numbers and 11.2 % in absorbed dose. The discrepancy in dose estimation was primarily attributed to differences in ellipse fitting methods used for LET calculations. Despite challenges in classifying small or low-contrast tracks, the proposed DNN-assisted method offers a promising solution for high-throughput, reliable, and standardized CR-39 track analysis in space radiation dosimetry.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107565"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145569906","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}

引用次数: 0