Radiation Measurements最新文献

{"title":"Electron spin resonance spectroscopy and Monte Carlo simulation for fossils age determination from new historical park in Thailand","authors":"Sirikorn Pongtornkulpanich ,&nbsp;Patcharin Naemchanthara ,&nbsp;Weeranut Kaewwiset ,&nbsp;Sumalee Ninlaphruk ,&nbsp;Pichet Limsuwan ,&nbsp;Kittisakchai Naemchanthara","doi":"10.1016/j.radmeas.2025.107569","DOIUrl":"10.1016/j.radmeas.2025.107569","url":null,"abstract":"<div><div>Ban Phot Historical Park in Phetchabun province is a new historical park in Thailand. However, the fossil remains in this historical park have been reported by taxonomic identification to be originating from the Carboniferous–Permian period. Confirming the age of these remains using electron spin resonance (ESR) spectroscopy coupled with neutron activation analysis is necessary. Sedimentary rocks from Ban Phot Historical Park were separated into fossil shells and soils. Taxonomic identification indicated that the overall morphologies corresponded to a brachiopod, specifically <em>Orthotichia javanapheti</em> and <em>Marginifera banphotensis</em>. The chemical composition and crystal structure of the fossil shells were examined by X-ray fluorescence spectroscopy and X-ray diffractometry, respectively, revealing high silicon content and a quartz phase. All fossil shells were applied irradiation doses ranging from 0 to 15 kGy. Free radicals were measured by ESR spectroscopy to quantify the accumulated dose (<em>AD</em>). The results demonstrated that the free radicals comprised CO₂⁻ species derived from carbonate. The <em>AD</em> varied from 9298.6 ± 186.0 Gy to 9516.1 ± 190.3 Gy. Neutron activation analysis determined the concentrations of ²³⁸U, ²³²Th, and ⁴⁰K in shells and soils for annual dose-rate (<em>D</em>) estimation. Thereafter, <em>AD</em> from ESR dating was combined with a Monte Carlo simulation to estimate fossil age. The ages obtained by ESR agreed with those derived via the Monte Carlo simulation using the DATA program, aligning with the Carboniferous period. Moreover, this age appears credible and may fill a gap in geological studies of the new historical park at Ban Phot, Phetchabun province.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107569"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615329","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":"Thermo and optically stimulated luminescence of magnesium tetraborate doped with cerium, gadolinium and lithium","authors":"Antônio Bernardo da Silva Neto ,&nbsp;Alcilene Cristina da Silva ,&nbsp;Charles Nilton do Prado Oliveira ,&nbsp;Raquel Aline Pessoa Oliveira ,&nbsp;Viviane Khoury Asfora ,&nbsp;Vinícius Saito Monteiro de Barros","doi":"10.1016/j.radmeas.2025.107557","DOIUrl":"10.1016/j.radmeas.2025.107557","url":null,"abstract":"<div><div>Optically Stimulated Luminescence (OSL) has emerged as a promising technique for ionizing radiation dosimetry. However, its widespread adoption has been hindered by the limited availability of suitable commercial materials. Recent developments have focused on magnesium tetraborate (<em>MgB</em>_<em>4</em><em>O</em>_<em>7</em>) doped with cerium and lithium (<em>Ce</em>^<em>3+</em>, <em>Li</em>^<em>+</em>), which exhibits favorable characteristics such as a near tissue-equivalent effective atomic number and potential sensitivity to both photon and neutron radiation. Research has shown that <em>Li</em> ^<em>+</em> enhances OSL and thermoluminescence (TL) sensitivity by acting as a charge compensator for rare-earth doping. This study presents the development of a novel triply-doped <em>MgB</em>_<em>4</em><em>O</em>_<em>7</em><em>:Ce,Gd,Li</em> material synthesized via a two-step sintering process. Previous findings indicated limited exploration of <em>Gd</em>^<em>3+</em> in OSL materials, despite its promising effects on TL and OSL response when co-doped with <em>Ce</em>^<em>3+</em>. This work builds on previous reports by demonstrating that appropriate <em>Gd</em>^<em>3+</em> concentrations can increase the OSL sensitivity, compared with materials doped only with <em>Ce</em>^<em>3+</em> and <em>Li</em>^<em>+</em>. This enhancement contributes to the development of alternative OSL dosimeters with broader application potential, particularly in mixed radiation fields.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107557"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468282","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":"Capabilities for the low background measurements of neutrons combining 6Li2O∗SiO2:Ce and 7Li2O∗SiO2:Ce glass detecting elements","authors":"M. Korzhik ,&nbsp;E. Borisevich ,&nbsp;O. Akimova ,&nbsp;A. Alexandrov ,&nbsp;A. Amelina ,&nbsp;I. Lagutskiy ,&nbsp;A. Mikhlin ,&nbsp;A. Fedorov ,&nbsp;V. Mechinsky ,&nbsp;I. Komendo ,&nbsp;K. Okhotnikova","doi":"10.1016/j.radmeas.2025.107553","DOIUrl":"10.1016/j.radmeas.2025.107553","url":null,"abstract":"<div><div>A lithium neutron-sensitive glass with the composition Li₂O∗SiO₂:Ce and partial substitution of SiO₂ with AlF₃ has been developed and evaluated for detecting properties. Samples enriched and depleted with the ⁷Li isotope have been produced. Glass demonstrated improved light yield and an increase in the n/γ ratio up to 2.6 when comparing the response to the thermal neutrons and 662 keV γ -rays of the ¹³⁷Cs source. The response to neutrons and γ-rays was found to be different in scintillation kinetics as well. Findings make possible future improvement of the glass-based scintillation detector sensitivity to the neutrons by combining the analysis of the amplitudes and the pulse shape of the signals from thermal neutrons and γ-rays.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107553"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468283","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":"Regeneration effect in optically stimulated luminescence of MgB4O7:Ce,Li","authors":"Paweł Bilski,&nbsp;Anna Mrozik,&nbsp;Mariusz Kłosowski,&nbsp;Michał Sądel,&nbsp;Maciej Budzanowski","doi":"10.1016/j.radmeas.2025.107554","DOIUrl":"10.1016/j.radmeas.2025.107554","url":null,"abstract":"<div><div>MgB₄O₇:Ce,Li, one of the most promising OSL materials, was found to exhibit a ‘regeneration effect’: when a CW-OSL measurement is followed by another one carried out after a period of delay, the intensity of the second signal begins at a level higher than the final intensity of the first measurement. The magnitude of this increase depends on the time of delay and reaches a maximum of nearly 10 % of the initial OSL signal after about 1–2 h following the first readout. No such increase was observed in the thermoluminescence of this material. Understanding of the mechanism of the regeneration effect requires further investigations, but it appears to be related to a migration of charge carriers between trapping sites, triggered by blue-light stimulation.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107554"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468279","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 investigation of Ge-doped silica fiber detectors for precision small field dosimetry","authors":"A. Khodaei ,&nbsp;F. Moradi ,&nbsp;H.T. Zubair ,&nbsp;S.A. Ibrahim ,&nbsp;H.A. Abdul-Rashid","doi":"10.1016/j.radmeas.2025.107552","DOIUrl":"10.1016/j.radmeas.2025.107552","url":null,"abstract":"<div><div>Accurate dosimetry in small radiation fields remains a critical challenge in modern radiotherapy due to high dose gradients and limited detector spatial resolution. This study investigates the dosimetric performance of Ge-doped silica fiber radioluminescence (RL) detectors for small field measurements through Monte Carlo simulations using the TOPAS tool. Reference data from IAEA database were utilized for implementation of small radiation fields and validation, by comparing experimental beam profile and depth dose measurements for various field sizes. Quality dependence factors (QDFs) were calculated based on the formalism of the IAEA-AAPM working group, considering a Varian Clinac iX linear accelerator with a 10 × 10 cm² reference field and various small fields of 0.5 × 0.5 cm², 1 × 1 cm², 2 × 2 cm² and 4 × 4 cm². The study explored different fiber detector diameters from 125 μm to 2 mm to optimize spatial resolution for small field dosimetry. Simulated electron spectra in various situations were analyzed in both water and fiber volumes to understand reasons behind detector response variations. Notably, the detector diameter significantly influenced quality dependence, with competing effects between energy dependence and a field size dependent spectral discrepancy leading to an optimal balance at a 0.5 mm fiber diameter. Calculated QDFs aligned well within the range reported for other detector types, supporting the applicability of Ge-doped silica fiber RL detectors for precise dose measurements in small radiation fields, offering a potential alternative for advanced radiotherapy applications.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107552"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468280","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":"Determination of 226Ra by chemical separation and radioactive equilibrium method","authors":"Sang-Jun Han,&nbsp;Bo-Gil Kim,&nbsp;Jun-Seok Kim,&nbsp;Su-Bin Choi","doi":"10.1016/j.radmeas.2025.107549","DOIUrl":"10.1016/j.radmeas.2025.107549","url":null,"abstract":"<div><div>A procedure for the determination of ²²⁶Ra in radioactive waste generated from institutions using predominantly single radionuclides was established by combining chemical separation with activity measurement through radioactive equilibrium. Representative matrices such as rubber, wipers, plastic, and stainless steel were selected, and the recovery yields were evaluated as 89.55 %, 78.39 %, 84.56 %, and 91.93 %, respectively. Following ²²⁶Ra separation, activity measurements based on the radioactive equilibrium of its progeny nuclides (²¹⁴Pb and ²¹⁴Bi) showed excellent agreement with reference values, with the maximum deviation being −3.16 %. The validity of the proposed procedure for chemical separation and activity concentration assessment was further confirmed using a proficiency test material distributed by the national standard institute. These results demonstrate that the developed methodology is appropriate and can serve as a key procedure for characterizing the radiological properties of radioactive waste containing ²²⁶Ra.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107549"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468284","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":"Characterization of MgB4O7:Ce3+,Li+ for application in sterile insect technique dosimetry","authors":"Lucas Mateus Ferreira de Amorim ,&nbsp;Arícia Ravane Pereira da Cruz ,&nbsp;Aline Taiane Macedo Pinto ,&nbsp;Jair Fernandes Virgínio ,&nbsp;Charles Nilton Prado Oliveira ,&nbsp;Vinícius Saito Monteiro de Barros ,&nbsp;Viviane Khoury Asfora","doi":"10.1016/j.radmeas.2025.107558","DOIUrl":"10.1016/j.radmeas.2025.107558","url":null,"abstract":"<div><div>The Sterile Insect Technique (SIT) is an ecological and environmentally safe method for controlling the population of specific insect species. To ensure the success of the technique, a key factor is to accurately control the absorbed dose used to treat insects. Therefore, accurate dosimeters for use in the range of tens to hundreds of Gray is essential. This work investigates the use of an MgB₄O₇:Ce³⁺,Li⁺ optically stimulated dosimeter (OSL) for applications in the SIT. The crystalline structure was confirmed by the X-ray diffraction (XRD). The irradiation setup adopted was the same used for insect irradiation in the Aedes Sterile Project (Moscamed Brazil/IAEA). A linear dose response was observed up to 200 Gy, followed by a supra-linear response and saturation around 200–500 Gy. A short term fading of approximately 20 % was observed after 6 h in initial OSL response. The signal remained stable from 6 h up to 28 days. Therefore, the study revealed a potential use of MgB₄O₇:Ce³⁺,Li⁺ in the dosimetry of the irradiation process for sterile insect technique.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107558"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518275","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":"An algorithm for identifying and removing abnormal nuclear pulse parameters","authors":"Zhiyong Lan,&nbsp;Hongquan Huang,&nbsp;Qiuyi Wang,&nbsp;Xingke Ma","doi":"10.1016/j.radmeas.2025.107551","DOIUrl":"10.1016/j.radmeas.2025.107551","url":null,"abstract":"<div><div>Due to the high complexity of its circuitry, the front-end analog system of nuclear radiation detectors exhibits considerable diversity and complexity in the output pulse waveforms. Under varying test conditions, environmental temperature, and humidity, the system may produce pulses with abnormal decay constants. Changes in decay constants can cause the pulse amplitude to increase or decrease, which interferes with the accurate extraction of the true pulse amplitude and ultimately degrades the accuracy of nuclear energy spectrum measurements.</div><div>This paper presents an innovative removing algorithm designed to eliminate pulses with abnormal decay constants. The removing algorithm operates as follows: A base waveform space is first constructed using complete, isolated, and non-overlapping nuclear pulses. The nuclear pulses are then projected into this waveform space to obtain both projection vectors and shadow waveform vectors. The shadow waveform vectors are incorporated as new information to update the waveform space, which is continuously refined so that the waveform space progressively acquires and represents the characteristic features of the pulse signals. When the nuclear pulse shares the same characteristics as the waveform space, the projection vector remains unchanged; however, when the pulse parameters are abnormal, the projection vector exhibits variation. The change in the projection vector is reflected by the magnitude of the error. A tolerance threshold is introduced: if the error exceeds this threshold, the nuclear pulse is considered to have abnormal parameters and is removed, resulting in a clean set of nuclear pulse signals. By adjusting the tolerance threshold, one can selectively retain pulses with minor variations in decay constants while removing those with large deviations. In a dataset consisting of 20,000 nuclear pulses, including 2000 with abnormal decay constants, the removing algorithm removed 1739 abnormal pulses when filtering based on decay constant variation, achieving an accuracy of 87.0 %. The resulting nuclear energy spectrum was corrected by eliminating the influence of these abnormal pulses.</div><div>A transformer model was employed to identify the parameters of nuclear pulses, achieving an identification accuracy of 99.3 % for the slow decay constant and 99.6 % for the fast decay constant. The identified parameters are incorporated into the secondary-edge flat-top pulse shaping algorithm, enabling it to accurately transform nuclear pulses into secondary-edge flat-top pulses, thereby achieving correction of the nuclear energy spectrum. The secondary-edge flat-top pulses utilize higher-order mathematical functions for edge transitions, which, compared to simple linear variations, exhibit smoother transitions and more pronounced amplitudes.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107551"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518273","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":"Impacts of geometry on efficiency of tapered and truncated conical LaBr3(Ce) scintillation detectors","authors":"Abouzeid A. Thabet ,&nbsp;Mohamed S. Badawi ,&nbsp;Ayman Hamzawy ,&nbsp;Mohamed I. Badawi ,&nbsp;Bohaysa A. Salem","doi":"10.1016/j.radmeas.2025.107546","DOIUrl":"10.1016/j.radmeas.2025.107546","url":null,"abstract":"<div><div>In high-energy physics and medical fields, researchers are generally searching for ideal scintillation detectors with the best geometry response. LaBr₃(Ce) is considered an excellent inorganic material, that can be used for this purpose. In this study, the geometrical solid angle, geometrical efficiency, effective solid angle, total efficiency, and average path length were calculated as functions of different parameters for both tapered and truncated conical LaBr₃(Ce) scintillation detectors to provide all of the characteristic factors that are required to calibrate these detector geometries. The calculations were conducted to optimize the efficiency by using isotropic radioactive point sources in axial and non-axial forms and the study was extended to isotropic radioactive disk and cylinder shape sources. The analytical–numerical technique presented in this study is a valuable approach for analyzing and constructing arrays of multiple γ-ray scintillation detectors, particularly for use in complex spectroscopy systems. The results provide a clear comparison between tapered and truncated conical LaBr₃(Ce) detectors. For example, at a source-to-detector distance of 5 cm, the geometric solid angle of the truncated conical crystal was determined as greater than that of the tapered crystal, but this relationship reversed as the distance increased due to the solid angle effect.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"190 ","pages":"Article 107546"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145468281","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 market and comparison of low-cost radon meters in Europe with the example of Poland","authors":"J. Kubiak ,&nbsp;D. Grządziel ,&nbsp;M. Basińska","doi":"10.1016/j.radmeas.2025.107539","DOIUrl":"10.1016/j.radmeas.2025.107539","url":null,"abstract":"<div><div>At the time of writing, there are over twenty affordable radon detectors available on the European market. Devices of this type could become a valuable tool for increasing measurements in buildings in the future, particularly in the context of short-term measurements aimed at assessing radon levels in buildings. The article analyses the market for inexpensive radon detectors from the user's perspective, assesses their availability and presents mathematical methods for comparing readings. The article is practical in nature as it discusses the advantages and disadvantages of selected models. The meters were subjected to a controlled comparative experiment in a radon chamber. The meters had an average error for instantaneous measurements ranging from 25 to 275 %. The aim of the study is to identify devices that may be of interest from the point of view of radon dosimetry, as well as to indicate gaps in knowledge about inexpensive meters for this element.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"189 ","pages":"Article 107539"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145363313","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}