High-resolution ion pulse ionization chamber with air filling for the Rn-222 decays detection

TL;DR

This paper presents a high-resolution ion pulse ionization chamber filled with air for detecting radon-222 decays, featuring improved energy resolution and noise immunity through digital pulse processing.

Contribution

It introduces a cylindrical ion pulse ionization chamber with digital pulse processing that achieves high energy resolution for radon decay detection.

Findings

Energy resolution of 1.6% for 5.49 MeV alpha particles

Reduced sensitivity to electromagnetic and mechanical noise

Dependence of resolution on voltage and pressure analyzed

Abstract

The construction and characteristics of the cylindrical ion pulse ionization chamber (CIPIC) with a working volume of 3.2 L are described. The chamber is intended to register alpha-particles from the $^{222}$Rn and its daughter's decays in the filled air sample. The detector is less sensitive to electromagnetic pick-ups and mechanical noises. The digital pulse processing method is proposed to improve the energy resolution of the ion pulse ionization chamber. An energy resolution of 1.6% has been achieved for the 5.49 MeV alpha-line. The dependence of the energy resolution on high voltage and working media pressure has been investigated and the results are presented.