Using 220Rn to calibrate liquid noble gas detectors

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Kobayashi, M.^1 ; Yamashita, M.^1 ; Takeda, A.^1 ; Kishimoto, K.^1 ; Moriyama, S.^1

Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Higashi-Mozumi, Kamioka, Hida, Gifu

506-1205, Japan^1

关键词: Calibration source;    Carrier gas;    Hot metal;    Liquid noble gas;    Liquid xenon;    Low-energy;    Test chambers;    Test Environment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/4/042069/pdf
DOI  :  10.1088/1742-6596/718/4/042069

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

In this paper, we describe220Rn calibration source that was developed for liquid noble gas detectors. The key advantage of this source is that it can provide212Bi-212Po consecutive events, which enables us to evaluate the vertex resolution of a detector at low energy by comparing low-energy events of212Bi and corresponding higher-energy α-rays from212Po. Since220Rn is a noble gas, a hot metal getter can be used when introduced using xenon as the carrier gas. In addition, no long-life radioactive isotopes are left behind in the detector after the calibration is complete; this has clear advantage over the use of222Rn which leaves longlife radioactivity, i.e.,210Pb. Using a small liquid xenon test chamber, we developed a system to introduce220Rn via the xenon carrier gas; we demonstrated the successful introduction of 6 ×102220Rn atoms in our test environment.