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arXiv · 2403.07405

Radon Concentration Measurement with a High-Sensitivity Radon Detector at the Yemilab

Kyungmin Seo·Hyunsoo Kim·Yeongduk Kim·Hyeyoung Lee·Jaison Lee·Moo Hyun Lee·Jungho So·Sangcheol Yoon·Youngsoo Yoon
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Abstract

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.

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Kyungmin Seo, Hyunsoo Kim, Yeongduk Kim, Hyeyoung Lee, Jaison Lee, Moo Hyun Lee, Jungho So, Sangcheol Yoon, Youngsoo Yoon. 2024-03-12. Radon Concentration Measurement with a High-Sensitivity Radon Detector at the Yemilab. https://arxiv.org/abs/2403.07405

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