The microdosimetric one-hit detector model for calculating the relative efficiency of the alanine pellet dosimeter in low energy x-ray beams

The alanine pellet dosimeter is a widely used reference in both medical and industrial dosimetry across wide range of beam qualities. A challenge when using low energy X-ray beams its strong dependence; significant decline observed the response per dose-to-water relative to irradiations cobalt-60 field. This decrease caused by physical difference water dose ratios combined with radiochemical intrinsic detector efficiency but difficult characterize mainly due experimental uncertainties. Here we have applied microdosimetric one-hit model beams. Microdosimetric distributions were estimated from track structure calculations Geant4-DNA Monte Carlo software, where literature data was determine free parameters. two sets spectra (40 kV 170 kV) medium (100 300 tube potential, covering 0.937 obtained for set variations between ?1.0% 1.5%, whereas varied approximately 0.925 0.985 set, correlation half-value layer beam. It concluded, that an not sufficient characterization uniquely dosimeter. However, variation respect small.