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首页> 外文学位 >Phototransfer thermoluminescence applied to the re-estimation of low dose levels of ionizing radiation for personnel dosimetry.
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Phototransfer thermoluminescence applied to the re-estimation of low dose levels of ionizing radiation for personnel dosimetry.

机译：光转移热致发光应用于人员剂量测定的低剂量电离辐射的重新估计。

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摘要

The characteristics and proven track record of thermoluminescence dosimetry (TLD) has made it one of the standards for personnel dosimetry. However, when TLD dosimeters are read, the majority of the information contained in them is lost. Dose re-estimation is the use of information left on the chips after the initial readout to estimate the dose received. This is useful in case the initial data are lost and for quality control purposes. Techniques in this field have focused on direct readouts of residual information contained on the chips and on using ultraviolet (UV) phototransfer to move information from inaccessible high-temperature traps to lower-temperature traps, the technique which was used in this work.;This study sought to improve upon earlier published re-estimation systems for LiF:Mg,Ti for use in personnel dosimetry systems. In order to do so, the parameters of a phototransfer thermoluminescence (PTTL) based re-estimation system were optimized to the extent possible without affecting the normal parameters of dosimeter readouts. Parameters of the PTTL system which were investigated for optimization included UV exposure, heating rate, and maximum readout temperature in an attempt to increase the net PTTL yield, the ratio of the PTTL signal minus the photoinduced thermoluminescence (PITL) background to the primary thermoluminescence signal, or (PTTL-PITL)/TL.;Based on the optimization results, the re-estimation protocol was then tested to determine the lowest dose level it could re-estimate and its accuracy. Re-estimation of doses as low as 2.44 mGy with better than +/-20% accuracy was demonstrated with a lowest detectable dose of 1.05 mGy and the potential for extension to lower dose levels. Importantly, this protocol is easily implementable into a pre-existing LiF:Mg,Ti-based dosimetry system and is one of the simplest protocols which can achieve sub-10mGy re-estimation. No additional training is required and additional capital costs would be small to any existing dosimetry program. Thus, the protocol described herein improves the accuracy and ease of implementation of a re-estimation system for personnel dosimetry and can be adopted by any dosimetry program which requires improved dose re-estimation capabilities.
机译：热致发光剂量学（TLD）的特性和经过验证的往绩使其成为人员剂量学的标准之一。但是，读取TLD剂量计时，其中包含的大多数信息都会丢失。剂量重新估计是使用在初始读出后留在芯片上的信息来估计接收到的剂量。如果初始数据丢失并用于质量控制，这将很有用。该领域的技术主要集中在直接读取芯片上残留的信息，以及利用紫外线（UV）光电转移将信息从难以接近的高温阱转移到低温阱，这是这项工作中使用的技术。这项研究试图改进早期发布的用于人员剂量测定系统的LiF：Mg，Ti重估系统。为此，在不影响剂量计读数的正常参数的情况下，尽可能优化了基于光传输热致发光（PTTL）的重新估算系统的参数。为优化性能而研究的PTTL系统的参数包括紫外线照射，加热速率和最大读出温度，以尝试提高净PTTL产量，PTTL信号减去光致热致发光（PITL）背景与主热致发光信号之比。 ；或（PTTL-PITL）/ TL 。；基于优化结果，然后对重新估算协议进行了测试，以确定可以重新估算的最低剂量水平及其准确性。以最低的1.05 mGy的可检测剂量以及扩展到较低剂量水平的潜力，证明了对低至2.44 mGy剂量的重新估计具有优于+/- 20％的准确度。重要的是，该协议很容易实现到预先存在的基于LiF：Mg，Ti的剂量学系统中，并且是最简单的协议之一，可以实现低于10mGy的重新估计。不需要任何额外的培训，并且对于任何现有的剂量学计划而言，额外的资本成本将很小。因此，本文描述的协议提高了用于人员剂量测定的重新估计系统的准确性和易于实施，并且可以被需要改进剂量重新估计能力的任何剂量测定程序采用。

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  • 作者

    Herr, Andrew D.;

  • 作者单位

    Georgetown University.;

  • 授予单位 Georgetown University.;
  • 学科 Health Sciences Occupational Health and Safety.;Biophysics Medical.;Physics Radiation.
  • 学位 M.S.
  • 年度 2010
  • 页码 66 p.
  • 总页数 66
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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