{"title":"评估 TL 和 OSL 剂量计的剂量率效应:对剂量率模型的批判性研究","authors":"S. Motta, E.G. Yukihara","doi":"10.1016/j.radmeas.2024.107305","DOIUrl":null,"url":null,"abstract":"<div><div>This work investigates theoretically possible dose rate effects in thermoluminescence (TL) and optically stimulated luminescence (OSL) materials by solving the rate equations for the stimulated luminescence process. Starting with the solution of the One-Trap–One-Recombination-Center (OTOR) model with parameters from the literature, we first showed that this model, with the chosen parameters, does not reproduce real luminescent material properties (e.g., TL curve and dose response). We then studied the physical phenomena responsible for dose rate effects in this model, and the influence of the model parameters on the dose rate response. As a result, we found that charge accumulation in the delocalized bands over unrealistic long periods (<span><math><mo>></mo></math></span> hundreds of seconds) is responsible for dose rate effects. Such effect is caused by the particular choice of model parameters. When model parameters based on physical considerations and experimental results are chosen, no dose rate effects are observed. This work provides a deeper understanding of the luminescence process, by identifying the mechanisms that could be responsible for dose rate effects, and a theoretical foundation to the use of luminescent detectors for ultra-high dose rate dosimetry.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assessing dose rate effects in TL and OSL dosimeters: A critical look into dose rate models\",\"authors\":\"S. Motta, E.G. Yukihara\",\"doi\":\"10.1016/j.radmeas.2024.107305\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This work investigates theoretically possible dose rate effects in thermoluminescence (TL) and optically stimulated luminescence (OSL) materials by solving the rate equations for the stimulated luminescence process. Starting with the solution of the One-Trap–One-Recombination-Center (OTOR) model with parameters from the literature, we first showed that this model, with the chosen parameters, does not reproduce real luminescent material properties (e.g., TL curve and dose response). We then studied the physical phenomena responsible for dose rate effects in this model, and the influence of the model parameters on the dose rate response. As a result, we found that charge accumulation in the delocalized bands over unrealistic long periods (<span><math><mo>></mo></math></span> hundreds of seconds) is responsible for dose rate effects. Such effect is caused by the particular choice of model parameters. When model parameters based on physical considerations and experimental results are chosen, no dose rate effects are observed. This work provides a deeper understanding of the luminescence process, by identifying the mechanisms that could be responsible for dose rate effects, and a theoretical foundation to the use of luminescent detectors for ultra-high dose rate dosimetry.</div></div>\",\"PeriodicalId\":21055,\"journal\":{\"name\":\"Radiation Measurements\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2024-10-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Radiation Measurements\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1350448724002531\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"NUCLEAR SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiation Measurements","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1350448724002531","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Assessing dose rate effects in TL and OSL dosimeters: A critical look into dose rate models
This work investigates theoretically possible dose rate effects in thermoluminescence (TL) and optically stimulated luminescence (OSL) materials by solving the rate equations for the stimulated luminescence process. Starting with the solution of the One-Trap–One-Recombination-Center (OTOR) model with parameters from the literature, we first showed that this model, with the chosen parameters, does not reproduce real luminescent material properties (e.g., TL curve and dose response). We then studied the physical phenomena responsible for dose rate effects in this model, and the influence of the model parameters on the dose rate response. As a result, we found that charge accumulation in the delocalized bands over unrealistic long periods ( hundreds of seconds) is responsible for dose rate effects. Such effect is caused by the particular choice of model parameters. When model parameters based on physical considerations and experimental results are chosen, no dose rate effects are observed. This work provides a deeper understanding of the luminescence process, by identifying the mechanisms that could be responsible for dose rate effects, and a theoretical foundation to the use of luminescent detectors for ultra-high dose rate dosimetry.
期刊介绍:
The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal.
Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.