INTERNATIONAL JOURNAL OF ENGINEERING, SCIENCE AND - Volume 5, Issue 2 , June 2016

Pages: 66-75

Date of Publication: 01-Jun-2016

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THE EFFECT OF RAPID COOLING ON THE RELATIVE SENSITIVITY OF THERMOLUMINESCENT DOSIMETERS (TLD-100H)

Author: Mahmoud Suleiman A. Dahoud* Iskandar Shahrim Mustafa** Muhammad Bakhsh***

Category: Engineering, Science and Mathematics

Abstract:

The sensitivity of TLD is an important issue due the need of accurate dosimetry and the reuse of thermoluminescent dosimeters. Annealing procedures for many times and environment affect its sensitivity. The first step before using dosimeter is to determine relative sensitivity for dosimeters to be used, and then low sensitive dosimeters cannot be used in measuring exposure signals, so it must be excluded. This study searches how to enhance relative sensitivity for excluded TLDs to be reused and how to improve the sensitivity of the used dosimeters so its readings can be trusted. From 43 dosimeters, 4 of them had a relative sensitivity out of range, but with rapid cooling; there relative sensitivity improved to be within the range. Other dosimeters showed better sensitivity with rapid cooling, so the use of rapid cooling can improve TLD sensitivity.

Keywords: thermoluminescent dosimeter (TLD), cooling, annealing, relative sensitivity.