Energy Correction Factors for MOSFET Dosimeter in ATOM Adult Male Phantom for Accurate Measurement of Organ Doses

Abstract

The MOSFET dosimeter is used to measure radiation dose in various medical applications and radiation safety. The advantage of the MOSFET dosimeter is that it is very small and provides (practically) real-time reading. However, given the fact that it is made mainly of silicon and epoxy, it shows some energy dependence for low-energy photons and will overestimate the energy deposition or absorbed dose when it is used in a phantom, due to the existence of scattered low-energy photons in the phantom. The present study determined, by Monte Carlo simulations with MCNPX, the relative response of the MOSFET dosimeter, and thereby the energy correction factors, at various dosimeter locations in the ATOM adult-male phantom, in order to be able to accurately measure organ and tissue doses.