Development of CaSO4: Dy-based ring badge for extremity dose monitoring of radiation workers in India.

Abstract

A new compact three-element Extremity Ring Badge (ERB) dosemeter has been developed for extremity dose monitoring of Indian radiation workers. This three-element dosemeter is based on indigenously developed CaSO4:Dy-Teflon discs as a thermoluminescent detector placed between suitable filters in a plastic holder. The dosemeter is designed and calibrated to measure the dose equivalent in terms of operational quantity Hp(0.07) at finger location. It can measure the doses from gamma, beta, and low-energy X-ray radiations and distinguish the beam quality (photon/beta) as well. The design features and results of the experimental studies conducted towards development of ERB dosemeter are presented. The dosemeter demonstrated satisfactory performance in the European Radiation Dosimetry Group (EURADOS) interlaboratory exercise (IC2024ext). The response of all test dosemeters were well within the trumpet curve, as per IEO 14146:2018 criteria, which validates the dose evaluation algorithm used for estimation of Hp(0.07) in the IC2024ext exercise.