Development of an algorithm for evaluating personal doses due to photon fields in terms of operational quantities for TLD badge system in India

Abstract

In order to evaluate and report the personal doses in terms of personal dose equivalent, the performance of the CaSO(4):Dy based thermoluminescence dosemeter (TLD) badge used for countrywide personnel monitoring in India is investigated using monoenergetic and narrow spectrum radiation qualities equivalent to those given in ISO standards. Algorithms suitable for evaluating H(p)(10) and H(p)(0.07) within +/- 30 % are developed from the responses of dosemeter elements/discs under different filters for normal as well as angular irradiation conditions using these beams. The algorithm is tested for TLD badges irradiated to mixtures of low- and high-energy ((137)Cs) beams in various proportions. The paper concludes with the results of test of algorithm by evaluation of badges used in the IAEA/RCA intercomparison studies and discussion on inherent limitations.

Study on the coefficient of variation in indian personnel monitoring system

“…Our study, how ever, consid ers only the dosemeter's re sponse due to pho ton radi a tion. The dosemeter is com prised of three iden ti cal CaSO 4 : Dy tef lon discs, each placed un der a dif fer ent fil ter [1].The read ings are car ried out in a ni tro gen gas heat ing-based semi au to matic TLD badge reader [4].…”

“…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

“…Personnel dosimeters, particularly, the thermoluminescence dosimeters (TLDs), are most commonly used to assess the dose received by radiation workers exposed to ionizing radiation from external sources. Personnel dosimeters often measure radiation exposure in terms of operational quantity which is personal dose equivalent (H p (d)) such as H p (10), H p (0.07), and H p (3) [1,2]. A realistic and conservative estimation of protection quantities is ensured by these quantities [3].…”

“…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.…”

“…In the present work, we aimed to develop an algorithm for estimating the average photon energy and the dose in terms of H p (d) from TL readouts of a three-element CaSO 4 :Dy dosimeter. Two separate ML models were developed for estimating the dose in terms of H p (10) and H p (0.07). The study shows that excellent accuracy can be achieved in the estimation of H p (d) by using CaSO 4 :Dy TLD badge with the help of ML models.…”