Pressure effect in the X-ray intrinsic position resolution in noble gases and mixtures

TL;DR

This paper investigates how gas pressure influences the intrinsic position resolution for X-ray and gamma-ray detection in noble gases and their mixtures, establishing a linear relationship and validating it against experimental data.

Contribution

It introduces a method to calculate intrinsic position resolution based on gas pressure and photon energy, validated with experimental data.

Findings

Position resolution improves with increased gas pressure.

A linear relationship between resolution and inverse pressure is established.

Strong agreement between calculated and experimental data is observed.

Abstract

A study of the gas pressure effect in the position resolution of an interacting X- or gamma-ray photon in a gas medium is performed. The intrinsic position resolution for pure noble gases (Argon and Xenon) and their mixtures with CO2 and CH4 were calculated for several gas pressures (1-10bar) and for photon energies between 5.4 and 60.0 keV, being possible to establish a linear match between the intrinsic position resolution and the inverse of the gas pressure in that energy range. In order to evaluate the quality of the method here described, a comparison between the available experimental data and the calculated one in this work, is done and discussed. In the majority of the cases, a strong agreement is observed.