Development of an algorithm for TLD badge system for dosimetry in the field of X and gamma radiation in terms of Hp(10)

Abstract

In view of the introduction of International Commission on Radiation Units and Measurements operational quantities Hp(10) and Hp(0.07), defined for individual monitoring, it became necessary to develop an algorithm that gives direct response of the dosemeter in terms of the operational quantities. Hence, for this purpose and also to improve the accuracy in dose estimation especially in the mixed fields of X ray and gamma, an algorithm was developed based on higher-order polynomial fit of the data points generated from the dose-response of discs under different filter regions of the present TL dosemeter system for known delivered doses. Study on the response of the BARC TL dosemeter system based on CaSO(4):Dy Teflon thermoluminescence dosemeter discs in the mixed fields of X and gamma radiation was carried out to ensure that the accuracies are within the prescribed limits recommended by the international organisations. The prevalent algorithm, based on the ratios of the disc response under various filters regions of the dosemeter to pure photons, was tested for different proportion of two radiations in case of mixed field dosimetry. It was found that the accuracy for few fields is beyond the acceptable limit in case of prevalent algorithm. The new proposed algorithm was also tested in mixed fields of photon fields and to pure photon fields of varied angles. It was found that the response of the dosemeter in mixed fields of photons and its angular response are satisfactory. The new algorithm can be used to record and report the personal dose in terms of Hp(10) as per the international recommendation for the present TL dosemeter.

Study on the coefficient of variation in indian personnel monitoring system

“…In In dia, a sin gle thermoluminescence (TL) based dosemeter de vel oped by the Bhabha Atomic Re search Cen tre (BARC) is ap proved for per son nel mon i tor ing of all ra di a tion work ers work ing with X, beta, and gamma ra di a tions. The per for mance char ac ter is tics of this dosemeter in terms of H p (10) are well es tab lished [1,2]. There are sev eral ac cred ited ser vice pro vid ers who of fer per son nel mon i tor ing us ing the said de vice.…”

A multi-stage machine learning algorithm for estimating personal dose equivalent using thermoluminescent dosimeter

“…Response of TLD badge in terms of operational quantities has been reported in a few studies [9,10,12,13,26]. These experimental TL response datasets were compiled, consisting of approximately 700 sets of TL readouts.…”

“…The energy and angular dependence of the response presents a challenge for the accurate estimation of occupational doses. The dose estimation algorithms presently used, either consider the angle-averaged response or the response at normal incidence to fit the response function [9][10][11][12][13]. When dealing with lower and intermediate photon energy, both the angular and energy response changes rapidly.…”