Title :
Characterization of a floating-gate radiation sensor for X-ray dose detection
Author :
Isern, E. ; Roca, M. ; Garcia-Moreno, E. ; Font, J.C. ; Cesari, J. ; Pineda, A.
Author_Institution :
Univ. of Balearic Islands, Palma de Mallorca, Spain
Abstract :
An ionizing radiation sensor based on a floating-gate capacitor with output in current mode has been tested as X-ray dose monitor for radiotherapy applications. The sensor had been initially designed for gamma rays dose detection in space missions proving its usefulness. In this new application the sensor has been tested with 6 MeV X rays at constant dose rate up to 3.6 krad of total dose. The measured sensitivity is -11.4 μA/krad. Once the output is corrected for ambient temperature variations the lowest detectable dose has been found to be 2 rad. Additionally, the sensor sensitivity to ambient temperature and supply voltage has been measured; we have found that both sensitivities are zero at specific total doses.
Keywords :
X-ray detection; capacitors; dosimeters; gamma-ray detection; radiation therapy; X-ray dose detection; X-ray dose monitoring; ambient temperature variations; electron volt energy 6 MeV; floating gate capacitor; floating gate radiation sensor; gamma rays dose detection; ionizing radiation sensor; radiotherapy applications; space missions; Capacitors; Current measurement; MOSFET; Radiation effects; Sensitivity; Temperature measurement; Temperature sensors; Floating gate MOSFET sensors; MOSFET radiation effects; X-ray dosimeter; gamma dosimeter;
Conference_Titel :
Radiation and Its Effects on Components and Systems (RADECS), 2013 14th European Conference on
Conference_Location :
Oxford
DOI :
10.1109/RADECS.2013.6937361
