The radiation emitted from radon is a critical background in rare event search experiments conducted at the Yemi Underground Laboratory (Yemilab) in Jeongseon, Korea. A Radon Reduction System(RRS) has been developed and installed in Yemilab to reduce radon concentration in the air. The RRS primarily provides a purified air of 50 m3/h to the cleanroom used to assemble crystal detectors in the AMoRE, a neutrinoless double beta decay search experiment. RRS can reduce the radon level by a factor of 300, so a high-sensitivity radon detector was required. A highly sensitive radon detector was constructed using a 70 L chamber with a large PIN photodiode to measure radon concentration in the purified air. The radon detector shows an excellent resolution of 72 keV (FWHM) for 6.003 MeV alphas from 218Po decay and a sensitivity down to 23.8 +- 2.1 mBq/m3 with a boil-off N2 gas sample. The radon concentration level from the RRS measured by the radon detector was below 0.29 Bq/m3 with a reduction factor of about 300.
@article{arxiv.2403.07405,
title = {Radon Concentration Measurement with a High-Sensitivity Radon Detector at the Yemilab},
author = {Kyungmin Seo and Hyunsoo Kim and Yeongduk Kim and Hyeyoung Lee and Jaison Lee and Moo Hyun Lee and Jungho So and Sangcheol Yoon and Youngsoo Yoon},
journal= {arXiv preprint arXiv:2403.07405},
year = {2024}
}
Comments
16 pages, 12 figures, 2 tables, to be published in JINST