Article

Rapid assessment of dose for large-scale individual: a feasibility study

¹ Medical Physics Department, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
² Cancer Research Center, Semnan University of Medical Sciences, Semnan, Iran
³ Physics Department, Faculty of Sciences, University of Birjand, Birjand, Iran

^* Corresponding authors: behmadim@semums.ac.ir; Behmadim881.mph@gmail.com; k.karimi@birjand.ac.ir;

Received: 27 August 2023
Accepted: 20 November 2023

Abstract

In certain situations, it is crucial to quickly estimate the dose for radiation workers across different weight percentiles. This study sets out to create weight percentiles above 50 by adding proper adipose and muscle layers around the revised ORNL hermaphrodite phantom torso. Neutron fluence-to-organ absorbed and effective dose conversion coefficients were calculated to different weight percentiles. Simulations were performed in the energy range 10⁻⁹ to 20 MeV, under Six different source irradiation geometries: anterior–posterior (AP), posterior–anterior (PA), right-lateral (RLAT), left-lateral (LLAT), Rotation (ROT), and Isotropic (ISO) by MCNPX code. The maximum relative differences observed between the 50^th and other percentiles ranged from 11% to 28%. Comparative analysis of the fluence-to-absorbed and effective dose conversion coefficients between the 95^th percentile and VIPMAN indicated that approximately 58% and 57% of the data had a relative difference below 15%, respectively overall neutron energies and irradiation geometries. Our finding demonstrate that this straightforward method is reliable, especially when the whole body is irradiated in the energies above 1 MeV.