Research of radon diffusion behavior in liquid scintillator

TL;DR

This paper investigates radon diffusion in liquid scintillator to better understand background signals in low-background detectors, providing new measurements of diffusion and solubility coefficients for the first time.

Contribution

It introduces novel methodologies for measuring radon diffusion and solubility in liquid scintillator, including the first measurement of radon diffusion coefficient in LS.

Findings

Radon diffusion coefficient in LS measured for the first time.

Radon solubility coefficient in LS determined.

Diffusion coefficient of polyolefine film verified against literature.

Abstract

The background caused by radon and its daughters is an important background in the low background liquid scintillator (LS) detectors. The study of the diffusion behaviour of radon in the LS contributes to the analysis of the related background caused by radon. Methodologies and devices for measuring the diffusion coefficient and solubility of radon in materials are developed and described. The radon diffusion coefficient of the LS was measured for the first time and in addition the solubility coefficient was also obtained. In addition, the radon diffusion coefficient of the polyolefine film which is consistent with data in the literature was measured to verify the reliability of the diffusion device.