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Modification of algorithm for accurate estimation of Hp(3) based on response of head TLD badge calibrated using ISO
Madhumita Bhattacharya1, Kasthuri Samuel1, Kshama Srivastava1
1Radiological Physics and Advisory Division, Bhabha Atomic and Research Centre (BARC), Mumbai 400085, India.
Abstract:
In India, the prevailing approach to eye lens dosimetry is the placement of an existing dosemeter on the forehead region after slight modification serves as a dedicated Eye Lens Dosemeter. A methodology for estimating the eye lens dose in terms of the Hp(3) has been previously explored employing an algorithm based on the response characteristics of this dosemeter using ISO slab phantom. It was observed that the performance of the dosemeter in terms of Hp(3) using previous algorithm showed under response at higher angles of incidence and photon beams of energy < 200 keV. Further, study was conducted to modify the algorithm following the latest ISO recommendations. This involved generation of data from the response of existing dosemeter on a cylindrical phantom. The results of this study revealed better performance of the newly established algorithm in estimating eye lens dose in terms of Hp(3) when compared to the earlier algorithm.
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