Speakers
Description
Authors (affiliation): Hyun Su Lee 1, Min Ji Han 1,2, Sanghoon Hwang (corresponding author) 1,2, Byoung-Chul Kim 1, Jong-Man Lee 1,2, and Kyoung Beom Lee 1,2.
1 Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea
2 University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
A recent increase of public concerns on radon exposure in Republic of Korea has made a great demand on radon measurement service and radon detectors as well. In a consequence of increased radon detector usage, demands on radon detector calibration has been increased. As a national metrology institute of Korea, Korea Research Institute of Standards and Science (KRISS) developed a radon calibration chamber for large-scale calibration (H.S. Lee et al.). The walk-in type chamber made of insulation panel has interior volume of 17.3 m3 and the ambient condition can be controlled in ranges of 0 ℃ – 60 ℃ for temperature and 20% – 90% for relative humidity. Radon from Ra-226 source was flown in a constant rate, and radon concentration in the chamber was maintained by equilibrium of generation, decay, and leakage of radon. To provide a calibration of radon detector with smaller uncertainty, even for low radon concentration, we developed new radon monitor based on the KRISS high-sensitivity radon monitor (S.H. Hwang et al. and M.J. Han et al.). New radon monitor based on electrostatic collection and alpha spectrometer is composed of four radon cells with a digital data acquisition system, Flash-ADC. New radon monitor was demonstrated in the walk-in type radon calibration chamber at various ambient condition and radon concentration. Effects of ambient condition on measurement and achievable calibration uncertainty will be discussed.
Reference
Lee, H.S., Hwang, S.H., Kim, B.C., Lee, J.M., Lee. K.B., 2022. Development of Walk-in Type Radon Calibration Chamber at KRISS. Journal of the Korean Physical Society, in-press.
Hwang, S.H., Han, M.J., Seon, Y.G., Lee, J.M., Lee, K.B., 2020. Development of a high-sensitivity radon monitor for a radon calibration system at KRISS. Appl. Radiat. Isot. 164:109228.
Han, M.J., Hwang, S.H., Heo, D.H., Kim, B.C., Lee, J.M., Lee, K.B., Seon, Y.G., 2021. Development of a mobile radon calibration system at KRISS. Journal of Radioanalytical and Nuclear Chemistry, 330, 571-576.
