Simulation and Optimization of Optical Fiber Irradiation with X-rays at Different Energies
by
, , , and
Arnaud Meyer
1
,
Damien Lambert
2,
Adriana Morana
1,
Philippe Paillet
2,
Aziz Boukenter
1 and
Sylvain Girard
1,* 
1
Laboratoire Hubert Curien, UMR-CNRS 5516, Université Jean Monnet, F-42000 Saint-Etienne, France
2
CEA, DAM, DIF, 91297 Arpajon, France
*
Author to whom correspondence should be addressed.
Radiation 2023, 3(1), 58-74; https://doi.org/10.3390/radiation3010006
Submission received: 14 February 2023
/
Revised: 6 March 2023
/
Accepted: 15 March 2023
/
Published: 20 March 2023
Simple Summary
We investigated the influence of modifying the voltage of an X-ray tube, and therefore its photon energy spectrum, on the Total Ionizing Dose deposited in a single-mode, radiation sensitive, optical fiber. Simulation data, obtained using a toolchain combining SpekPy and Geant4 software, are compared to experimental results and demonstrate an increase of the deposited dose with operating voltage, which is mainly caused by low-energy photons below 30 keV.
Abstract
We investigated the influence of modifying the voltage of an X-ray tube with a tungsten anode between 30 kV and 225 kV, and therefore its photon energy spectrum (up to 225 keV), on the Total Ionizing Dose deposited in a single-mode, phosphorus-doped optical fiber, already identified as a promising dosimeter. Simulation data, obtained using a toolchain combining SpekPy and Geant4 software, are compared to experimental results obtained on this radiosensitive optical fiber and demonstrate an increase of the deposited dose with operating voltage, at a factor of 4.5 between 30 kV and 225 kV, while keeping the same operating current of 20 mA. Analysis of simulation results shows that dose deposition in such optical fibers is mainly caused by the low-energy part of the spectrum, with 90% of the deposited energy originating from photons with an energy below 30 keV. Comparison between simulation and various experimental measurements indicates that phosphosilicate fibers are adapted for performing X-ray dosimetry at different voltages.
Keywords:
optical fibers; X-ray tubes; Geant4; radiation effects; dosimetry
