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首页> 外文学位 >PROBLEMS ASSOCIATED WITH LARGE SCALE PERSONNEL MONITORING OF PHOTONS USING LITHIUM-FLUORIDE TLD-100 (THERMOLUMINESCENCE, PRECISION, ACCURACY, RADIATION)
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PROBLEMS ASSOCIATED WITH LARGE SCALE PERSONNEL MONITORING OF PHOTONS USING LITHIUM-FLUORIDE TLD-100 (THERMOLUMINESCENCE, PRECISION, ACCURACY, RADIATION)

机译：使用氟化锂TLD-100对大型人员进行光子监控的问题（热发光，精密度，准确度，辐射度）

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摘要

The dosimetric properties of a large batch of lithium fluoride TLD-100 dosimeters when exposed to photons for total absorbed doses in the region from 0.1 - 1.0 mGy (10 - 100 mr) have been examined in this work. This region is of particular importance because in many operational health physics situations the majority (>90%) of all recorded absorbed doses to personnel lie in this region. With the possibility that occupational radiation dose limits may be reduced in the future, accurate monitoring of individuals in this region will be of prime importance.;The use of lithium fluoride thermoluminescent dosimeters rather than photographic emulsions to monitor radiation exposures is becoming more and more widespread. The majority of systems use lithium fluoride TLD-100, a dosimetry phosphor manufactured by the Harshaw Chemical Company. Favorable characteristics of this material include its near tissue equivalence and reusability. The popularity of this material can be guaged from the USAF's decision to switch entirely from film to a TLD-100 based dosimetry system, making them the largest single user of this material.;It is important to realize, however, that accurate dosimetric measurements in the region from 0.1 to 1.0 mGy are difficult to accomplish on a large scale if the inherent characteristics of the material are not fully understood. The purpose of this thesis was to point out several effects which could compromise accurate dosimetric measurements in this region and to suggest some methods to minimize them. These effects include the effect of TLD batch composition, overresponse of the dosimeter to low energy photons, dose rate effects, the effects of storing the dosimeter before readout, and possible interference from ultraviolet and radiofrequency radiation. Each of these items can cause errors which can range up to 70%, depending on the total absorbed dose and the particulars of the radiation exposure. One effect which is of extreme interest is the induction of a thermoluminescent signal by radiofrequency radiation. Although this effect can cause gross errors in estimating the ionizing dose, it opens the possibility that LiF or another phosphor may have an application as a non-ionizing radiation dosimeter.
机译：在这项工作中，已经检查了大批氟化锂TLD-100剂量计在暴露于光子中的总吸收剂量在0.1-1.0 mGy（10-100 mr）范围内的剂量特性。该区域特别重要，因为在许多运行健康物理情况下，记录的对人员的所有吸收剂量中的大部分（> 90％）都位于该区域。随着将来可能会降低职业辐射剂量限制的可能性，对该区域内的个人进行准确的监测将是至关重要的。氟化锂热致发光剂量计而不是照相乳剂用于监测辐射的照射越来越普遍。大多数系统使用氟化锂TLD-100，这是一种由Harshaw化学公司生产的剂量学荧光粉。该材料的有利特性包括其在组织附近的等效性和可重复使用性。可以从USAF决定完全从胶片切换到基于TLD-100的剂量测定系统来判断这种材料的受欢迎程度，这使它们成为该材料的最大单一用户。但是，重要的是要实现精确的剂量测量。如果不能充分了解材料的固有特性，则很难大规模实现0.1至1.0 mGy的区域。本文的目的是指出可能影响该区域精确剂量测量的几种影响，并提出一些使它们最小化的方法。这些影响包括TLD批次组成的影响，剂量计对低能光子的过度响应，剂量率影响，读数前存储剂量计的影响以及可能受到紫外线和射频辐射的干扰。这些项目中的每一项都可能导致误差，误差范围高达70％，具体取决于总吸收剂量和辐射暴露的具体情况。引起极大关注的一种效应是通过射频辐射感应热致发光信号。尽管这种影响会在估算电离剂量时引起严重误差，但它打开了LiF或其他磷光体可作为非电离辐射剂量计应用的可能性。

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  • 作者

    LEONOWICH, JOHN ANTHONY.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Environmental science.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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