Liu J C, Sims C S, Ahmed A B
Stanford Linear Accelerator Center, CA 94309.
Health Phys. 1992 Sep;63(3):316-23. doi: 10.1097/00004032-199209000-00007.
It is common practice for a worker exposed to a mixed field with neutrons to wear both a photon-beta dosimeter and a neutron dosimeter. In this study, a thermoluminescence dosimeter has been designed and is proposed for use in mixed fields. The maximum applicable ranges of the mixed field can have photons with unknown energy from 20 keV to 2 MeV, betas with unknown energy from 147Pm to 90Sr-Y, and neutrons of known energy from thermal to 15 MeV. This proposed dosimeter (a combination of Harshaw beta-gamma thermoluminescence dosimeter and albedo neutron thermoluminescence dosimeter) has an advantage of using a minimum number of thermoluminescence dosimeter elements (therefore, making it less costly) to measure the dose equivalents in a mixed field of neutron, photon, and beta radiation. The basic dosimeter design consists of four thermoluminescence elements of TLD-600 and TLD-700 with different filtrations. Using the high-temperature peak methodology for TLD-600 and a filtration algorithm, the neutron, photon, and beta dose equivalents in a mixed field can be determined. The design, detection principle, and three dosimetric algorithms for three versions of the basic design of the four-element dosimeter are presented and discussed. The work that is required for the proposed dosimeter to be usable when it is made is also presented.
对于暴露于含中子混合辐射场的工作人员而言，佩戴光子 - β剂量计和中子剂量计是常见做法。在本研究中，已设计出一种热释光剂量计，并提议用于混合辐射场。该混合辐射场的最大适用范围包括能量未知的20 keV至2 MeV的光子、能量未知的147Pm至90Sr - Y的β粒子以及能量已知的热中子至15 MeV的中子。这种提议的剂量计（哈肖β - γ热释光剂量计和反照率中子热释光剂量计的组合）具有使用最少数量的热释光剂量计元件（因此成本较低）来测量中子、光子和β辐射混合场中剂量当量的优势。基本剂量计设计由四个具有不同滤过的TLD - 600和TLD - 700热释光元件组成。利用TLD - 600的高温峰方法和一种滤过算法，可确定混合场中的中子、光子和β剂量当量。本文介绍并讨论了四元件剂量计基本设计的三个版本的设计、探测原理和三种剂量学算法。还介绍了所提议的剂量计在制作后可供使用所需开展的工作。
