A unified approach to deconvolution radiation spectra measured by radiochromic films

Abstract

A method for the evaluation of energy distribution of a radiation source on the basis of measured space distribution of deposited energy is proposed. The measured data were obtained by using radiochromic films. Mathematical modeling is defined as a Fredholm integral equation inversion problem. Negative solutions were treated as an additional condition expressed through undefined energy group boundaries, caused by virtue of the physical phenomenon of statistical uncertainty. Examples are given of the electron source and neutron radiation field

Monte Carlo dose calculations of shielding disks with different material combinations in intraoperative electron radiation therapy (IOERT)

“…IOERT dosimetry is considered as a challenge, due to the 10-20 Gy delivered to the target area in a single session including the difficulty of pretreatment planning. For tuning an MC model, many approaches can be considered, such as direct measurement by inserting a film close to the initial electrons source, then the energy spectrum is obtained by a deconvolution algorithm, but this is difficult because it requires the opening of the linear accelerator and the removal of most of its internal parts [33]. The first MC model of the Mobetron was done by Janssen et al [34].…”