http://arxiv.org/abs/1603.02904
In this paper, we describe 220Rn calibration source that was developed for liquid noble gas detectors. The key advantage of this source is that it can provide 212Bi-212Po consecutive events, which enables us to evaluate the vertex resolution of a detector at low energy by comparing low-energy events of 212Bi and corresponding higher-energy alpha-rays from 212Po. Since 220Rn 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 of 222Rn which leaves long- life radioactivity, i.e., 210Pb. Using a small liquid xenon test chamber, we developed a system to introduce 220Rn via the xenon carrier gas; we demonstrated the successful introduction of 6 times 10^2 220Rn atoms in our test environment.
M. Kobayashi, M. Yamashita, A. Takeda, et. al.
Thu, 10 Mar 16
7/49
Comments: 6 pages,10 figures, to appear in Proceedings of the 14th international conference on Topics in Astroparticle and Underground Physics: TAUP2015, Torino, Italy
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