The development of radioactivity measurement system in gases

TL;DR

This paper presents a new gas radioactivity measurement system combining an electrostatic radon detector and a low-radioactivity proportional counter, enabling precise detection of radioactive impurities in gases.

Contribution

It introduces a novel measurement device with evaluated performance metrics, improving detection accuracy for radioactive impurities in gases.

Findings

Calibration factor for $^{222}$Rn: 27.4±0.2 count/day/mBq

Background rate of $^{222}$Rn: 0.84±0.13 mBq

Device effectively measures radon impurities in gases

Abstract

A device for measuring radioactive impurities in gas is developed, consisting of an electrostatic collection type radon detector and an extremely low radioactivity proportional counter. This device measures the radioactive impurities released by materials into the gas and a filtering test for radon removal from gas. The performance of the newly developed proportional counter was evaluated by measuring radon rate. The calibration factor of $^{222}$Rn as 27.4$\pm$0.2~count/day/mBq and the background rate of $^{222}$Rn as 0.84$\pm$0.13~mBq were estimated.