Radiation Measurements最新文献

{"title":"Flattop leakage dose characterization","authors":"A.S. Tamashiro ,&nbsp;B. Champine ,&nbsp;P. Witter ,&nbsp;P. Maggi ,&nbsp;D.P. Heinrichs ,&nbsp;C. Percher ,&nbsp;D.P. Hickman ,&nbsp;K.L. Jeffers ,&nbsp;R. Radev ,&nbsp;L.I. Tai ,&nbsp;B. Bandong ,&nbsp;T. Classen ,&nbsp;R. Hudson ,&nbsp;D. McAvoy ,&nbsp;J. Scorby ,&nbsp;J. Goda ,&nbsp;T. Cutler ,&nbsp;J.A. Bounds ,&nbsp;D. Hayes ,&nbsp;D. Ward ,&nbsp;M. Baumann","doi":"10.1016/j.radmeas.2025.107531","DOIUrl":"10.1016/j.radmeas.2025.107531","url":null,"abstract":"<div><div>Upon the completion of characterizing the Godiva-IV leakage dose in 2014 and a nuclear accident dosimeter (NAD) intercomparison exercise in 2016, the U.S. Department of Energy (DOE) Nuclear Criticality Safety Program (NCSP) supported an experimental campaign to characterize the Flattop leakage dose in 2017. Two Rotating Neutron Spectrometers (ROSPEC) and a Passive Neutron Spectrometer (PNS) were used to measure the neutron spectra. The neutron spectra were converted to neutron dose using dose conversion factors. CaF<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>:Mn thermoluminescent dosimeters (TLDs), LiF TLDs, and radiophotoluminescence dosimeters were used to measure the photon doses. The data were documented in a report at that time but this paper reanalyzed and updated results. This work established updated reference neutron and photon doses as a function of radial distance from the center of Flattop, which will be used for future NAD intercomparison exercises.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107531"},"PeriodicalIF":2.2,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220924","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":"Directional capacity of a two detector array for localization of gamma emitting sources","authors":"Harri Toivonen ,&nbsp;Mark Dowdall ,&nbsp;Sakari Ihantola ,&nbsp;Aliaksandr Dvornik ,&nbsp;Maria Karampiperi ,&nbsp;Robert Finck ,&nbsp;Pernille Ahlmann Jensen ,&nbsp;Gísli Jónsson ,&nbsp;Philip Holm ,&nbsp;Jussi Huikari ,&nbsp;Kari Peräjärvi ,&nbsp;Christopher Rääf ,&nbsp;Viktor Lehmann ,&nbsp;Christian Bernhardsson","doi":"10.1016/j.radmeas.2025.107534","DOIUrl":"10.1016/j.radmeas.2025.107534","url":null,"abstract":"<div><div>Capacities for source localization in response to incidents involving radioactive materials are essential for effective, efficient response. In this context, the directional response of a detection system is of importance. Many solutions currently employed for source localization involve approaches that may be onerous with respect to cost, complexity and practicality for field operations. To avoid these drawbacks, an approached was developed based on simultaneous use of two gamma detectors (2 x 1 array). Simple mathematical models were developed to cope with the count rate detected by two adjacent detectors. The parameters of the model depend mainly on the design of the detectors and can thus be concluded from the drawings. For large detectors, the energy dependency of the directional estimate is negligible. The method can be applied for small hand-held systems as well without resort to complex calibrations or data processing. The directional response of several 2 x 1 arrays, constructed from commercially available, off-the-shelf detectors, was confirmed using Monte Carlo approaches and actual measurements under controlled conditions. Optimization strategies and performance constraints were described and analyzed regarding the use of a shield between the detectors. Results indicate that 2 x 1 arrays of a number of detector types and sizes can provide functional estimates of source direction a field of view of 180°.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107534"},"PeriodicalIF":2.2,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220925","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":"Experimental evaluation of radon detector performance under controlled conditions: Statistical assessment and calibration strategy","authors":"A. Noverques,&nbsp;B. Juste,&nbsp;C. Trull-Hernandis,&nbsp;G. Verdu","doi":"10.1016/j.radmeas.2025.107532","DOIUrl":"10.1016/j.radmeas.2025.107532","url":null,"abstract":"<div><div>This work presents a quantitative evaluation of radon detectors under controlled environmental conditions using the RDN-SENUBIO-UPV radon chamber. The study emphasizes the statistical assessment of spatial radon distribution and the comparative sensitivity analysis of multiple detector models against a high-precision AlphaGUARD monitor. A comprehensive methodology is developed, involving the calculation of relative errors, analysis of variance (ANOVA), and normality testing (Kolmogorov–Smirnov), to assess measurement consistency. Moreover, individual correction factors are derived and validated through repeated experimental trials to improve the accuracy of time-dependent measurements. The proposed calibration protocol enhances measurement reliability by accounting for detector-specific response dynamics and environmental transients. The results support the implementation of reproducible correction schemes and contribute to improved quality assurance practices in radon monitoring. The approach provides a rigorous statistical framework applicable to other radiation detection systems.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107532"},"PeriodicalIF":2.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159090","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":"Modeling the stochastic-deterministic boundary in luminescence: Consequences for dose estimation","authors":"Eren Şahiner","doi":"10.1016/j.radmeas.2025.107529","DOIUrl":"10.1016/j.radmeas.2025.107529","url":null,"abstract":"<div><div>Kinetic models based on deterministic ordinary differential equations (ODEs) are effective for macroscopic systems, but a breakdown of their foundational assumptions is observed for single-grain and nanodosimetric applications where particle numbers are small. In this study, the metrological consequences of this stochastic-deterministic divergence are quantitatively investigated. The study's primary contribution is to deconvolve the divergence into two distinct components: a robust, inherent imprecision and a model-dependent, systematic inaccuracy. Intrinsic physical stochasticity is confirmed to be a dominant source of imprecision, generating an irreducible dose uncertainty of over 20 % that accounts for a significant fraction of single-grain overdispersion. Conversely, a systematic inaccuracy (e.g., a &gt;50 % dose bias), initially observed in a simplified model, is demonstrated to be a methodological artifact, not a universal consequence of discreteness. It is shown that this systematic bias can be reduced to negligible levels (&lt;1 %) by using either a more physically realistic multi-trap model or a correctly specified simple model. Based on this deconvolution, analytical protocols are assessed. An \"Average-Dose-First\" protocol is identified as the superior method, as it provides an accurate final dose estimate while correctly propagating measurement uncertainty. A general framework for understanding and partitioning variance in luminescence data is thereby established. Practical recommendations are provided for improving the accuracy of modern luminescence science by selecting appropriate models and using correct statistical protocols, with a strong emphasis on the critical need for model validation.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107529"},"PeriodicalIF":2.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119384","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":"Application of deep learning-based track detection technique in neutron personal dose monitoring research","authors":"Yuji Miao ,&nbsp;Wei Chen ,&nbsp;Lu Tian ,&nbsp;Xiaodong Shi ,&nbsp;Yuanyuan Zhou ,&nbsp;Xiangyong Fan ,&nbsp;Jiayi Ma ,&nbsp;Jin Wang","doi":"10.1016/j.radmeas.2025.107526","DOIUrl":"10.1016/j.radmeas.2025.107526","url":null,"abstract":"<div><div>This study introduces the application of the object detection paradigm (Faster R-CNN) to fast neutron track detection using deep learning algorithms. Neutron dose measurements were conducted using CR-39 detectors, and two methods-morphological features-based detection and deep learning (Faster R-CNN) were evaluated. The deep learning method demonstrated superior accuracy, particularly in identifying small tracks and impurity points, achieving a correct-count rate of 98.7 %. Additionally, it significantly improved detection speed compared to manual and morphological feature-based methods. The performance of the neutron personal dosimetry system, which incorporates the deep learning approach, was validated through linearity validation, coefficient of variation analysis, and dose verification. Due to its fully automated nature, this method can reduce measurement uncertainty and can be extended to recognize other types of particle tracks.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107526"},"PeriodicalIF":2.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220923","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":"Copper-based halide Cs3Cu2I5: (X) bulk single crystals: Growth and applications","authors":"Jianjia Li,&nbsp;Yunfei Ren,&nbsp;Zhicheng Wang,&nbsp;Xiaoming Li","doi":"10.1016/j.radmeas.2025.107527","DOIUrl":"10.1016/j.radmeas.2025.107527","url":null,"abstract":"<div><div>Low-dimensional copper-based halides have garnered wide attention due to their strong self-trapped exciton (STE) emission, among which, Cs₃Cu₂I₅ (CCI), characterized by a zero-dimensional electronic structure, exhibits promising application potential across multiple fields owing to its non-toxicity and excellent environmental stability. Notably, its exceptional radioluminescence properties make it an outstanding scintillator material for high-energy radiation detection. In recent years, although reports on diverse CCI material morphologies abound, bulk single crystals have become the primary focus because of their superior light output and low defect density. In this review, we systematically summarize and discuss the growth methodologies and applications of CCI bulk single crystals, which encompasses both melt and solution growth techniques, as well as currently developed and potentially superior application scenarios. Furthermore, we dedicate a section to discuss doping engineering strategies applied to CCI materials and the resultant property enhancements. Finally, the key challenges and future research directions for CCI bulk single crystals are outlined.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107527"},"PeriodicalIF":2.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159089","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 source analysis of beamline stations at fourth-generation synchrotron light facility","authors":"Jiaduo Chen ,&nbsp;Shiping Jiang ,&nbsp;Penghui Yang ,&nbsp;Lin Wang","doi":"10.1016/j.radmeas.2025.107528","DOIUrl":"10.1016/j.radmeas.2025.107528","url":null,"abstract":"<div><div>Bremsstrahlung produced by electrons in the storage ring is a major concern in the radiation shielding design of synchrotron light sources, primarily arising from the Touschek effect and vacuum-related effect. Depending on the underlying mechanism, the resulting bremsstrahlung is classified as either solid or gas bremsstrahlung, both of which can propagate into beamline stations, especially from straight sections, thereby posing radiological risks to personnel and equipment.</div><div>With the advancement of fourth-generation synchrotron light sources based on diffraction-limited storage ring technology, the characteristics of bremsstrahlung radiation originating from straight sections have become increasingly complex, making earlier radiation source models no longer directly applicable. The objective of this study is to conduct an analysis of radiation sources in beamline stations of fourth-generation synchrotron facilities, clarify their respective contributions, and evaluate the implications of different modeling methodologies for shielding design. This study focuses on a representative beamline at the Hefei Advanced Light Facility. Three modeling approaches are developed and compared: (i) a simplified model, which assumes uniform electron losses throughout the storage ring with fixed-angle impacts on internal surfaces; (ii) a more refined model, which uses ELEGANT to accurately simulate electron loss positions and dynamics in straight sections, coupled with FLUKA to analyze the generation and transport of solid bremsstrahlung; and (iii) a gas bremsstrahlung model, which employs FLUKA to directly simulate electron–residual gas interactions.</div><div>The study compares the energy spectra, angular distributions, and spatial profiles of bremsstrahlung from the three models on the upstream wall of the first optical enclosure. Ambient dose equivalent distributions surrounding the enclosure are also evaluated. Results indicate that both solid and gas bremsstrahlung are major contributors to radiation levels in the beamline stations, each exhibiting distinct spatial and spectral characteristics. In addition, the study finds that the simplified model introduces significant deviations in the estimation of solid bremsstrahlung, highlighting the importance of accurately incorporating electron loss information in radiation simulations for beamline stations at fourth-generation synchrotron light sources to achieve reliable shielding assessments.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107528"},"PeriodicalIF":2.2,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097124","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":"Quantification of neutron dose for the 7Li(p,n)7Be reaction at Ep = 66 MeV at the iThemba LABS high-energy neutron facility","authors":"Elizabeth Fairall ,&nbsp;Tanya Hutton ,&nbsp;Peane Maleka ,&nbsp;Andy Buffler","doi":"10.1016/j.radmeas.2025.107516","DOIUrl":"10.1016/j.radmeas.2025.107516","url":null,"abstract":"<div><div>A metrological characterisation of a high-energy neutron field at the iThemba Laboratory for Accelerator-Based Sciences (LABS) was combined with Monte Carlo radiation transport simulations to estimate the absorbed dose delivered to vials of human blood for an experimental setup relevant to conducting radiobiology experiments at this facility. Neutrons with a peak energy of 62.34(37) MeV were produced by a 66.48 MeV proton beam irradiating an 8.0 mm lithium target. The neutron beam energy distribution and fluence were characterised at emission angles of 0° and 16° via Time-of-Flight measurements with a BC-501A liquid scintillation detector, a ²³⁸U fission ionisation chamber, and two beam monitors. These measurements were combined with Monte Carlo radiation transport simulations developed in Geant4 to calculate the absorbed dose that would be delivered to four vials of human blood contained in high-density polyethylene phantoms placed at a distance of 4.300 m from the target during a typical irradiation. The absorbed dose delivered to each blood vial per unit monitor count was estimated and combined with measured monitor count rates to determine the absorbed dose rate. Depending on the vial position in the phantom, dose rates ranged from 24.36(78) mGy hour⁻¹ to 26.22(84) mGy hour⁻¹ at 0°, and from 13.16(42) mGy hour⁻¹ to 14.21(46) mGy hour⁻¹ at 16°.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107516"},"PeriodicalIF":2.2,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097122","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":"Experimental investigation of a heatless approach for initializing radiophotoluminescence glasses (FD-7) using ultraviolet light","authors":"Soheil Aghabaklooei ,&nbsp;Hiroshi Yasuda","doi":"10.1016/j.radmeas.2025.107525","DOIUrl":"10.1016/j.radmeas.2025.107525","url":null,"abstract":"<div><div>Ag-doped phosphate radiophotoluminescence (RPL) glass dosimeter (RPLD) is widely used for radiation dosimetry. Although RPLD has the advantage of reusability through proper annealing, the current annealing process has undesirable features, such as heating at a high temperature (approximately 400 °C) and subsequent long (nearly half a day) cooling. In this study, we propose a new approach to initialize RPLDs more safely and rapidly using ultraviolet light (UV), which is expected to be preferable in many occasions, including quality assurance (QA) for radiotherapy. Four samples of commercially available RPLD glass (FD-7) with a size of φ1.5 mm × 12 mm were irradiated with X-rays (160 kV, 6.3 mA) at 0.1, 0.5, 1, 2, and 5 Gy (for H₂O) and exposed to UV from a high-pressure mercury UV lamp, which has a broad wavelength range with a dominant peak at 365 nm. RPL intensities were measured using an exclusive RPL readout system (FDG-1000, Asahi Techno Glass Co., Ltd.) at certain time intervals at room temperature. After 3-h UV exposure, the RPL intensity decreased by &gt;90 % for irradiation of 1 Gy or higher, and 6-h UV exposure cleared &gt;95 % of the RPL intensity for 2 Gy or higher. The RPL intensity increased slightly (2 % in 24 h at room temperature) after the termination of UV exposure. According to these findings, it is expected that the proposed heatless approach to initialize RPLDs, named ‘UV-annealing method’ here, will be effectively applied to routine dosimetry in relatively high-dose radiation fields, including radiotherapy facilities.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107525"},"PeriodicalIF":2.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047642","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":"Distributed IoT-based radon monitoring in indoor spaces: Quantifying spatial gradients using multi-node Si-PIN arrays","authors":"Chao Xie ,&nbsp;Chunyun Jiang ,&nbsp;Tao Qiu ,&nbsp;Xiaodong Wang ,&nbsp;Guoqiang Zeng ,&nbsp;Shengyang Feng","doi":"10.1016/j.radmeas.2025.107524","DOIUrl":"10.1016/j.radmeas.2025.107524","url":null,"abstract":"<div><div>Indoor radon gas exposure is a major source of ionizing radiation for the public, and its spatial distribution is highly heterogeneous. However, traditional single-point monitoring devices struggle to capture gradient changes, and high costs restrict large-scale deployment. This study developed an Internet of Things (IoT)-based Distributed Radon Monitoring System (DRMS) to achieve high-resolution spatial monitoring by integrating low-cost silicon-based (Si-PIN) sensor arrays with adaptive anti-jamming Zigbee networks. The system employs multiple radon concentration sensors to enhance sensitivity and constructs a star-cluster hybrid topology wireless network, ensuring reliable communication in complex environments (1000 m in line-of-sight and 300 m in non-line-of-sight). Experimental validation shows that DRMS demonstrates good temporal consistency with the standard radon detector RAD7 (Durridge Company Inc., USA) within the dynamic range of 100–300 Bq.m⁻³. It can capture spatial gradients of radon concentration up to 4.27 times in enclosed spaces (e.g., median value of 228.5 Bq.m⁻³ in corner areas vs. 53.5 Bq.m⁻³ in near-window areas), which matches the results of computational fluid dynamics (CFD) simulations (R² = 0.962). The system provides a cost-effective and precise tool for radon risk assessment in complex environments such as mines and basements, holding significant value for achieving precise prevention and control of radon exposure risks and public health protection.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107524"},"PeriodicalIF":2.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057436","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}