Speaker
Description
Authors (affiliation): 1. Sanghoonn Hwang (KRISS, Republic of Korea), 2. Min Ji Han (KRISS, Republic of Korea), 3. B.C. Kim (KRISS, Republic of Korea), 4. J.Man Lee (KRISS, Republic of Korea), 5.D.H. Heo (KRISS, Republic of Korea), 6. K. B Lee (KRISS, Republic of Korea).
Recently, Radon (Rn-222) and Thoron (Rn-220) made an issue in Republic of Korea, since the mattresses from domestic manufactures release the radon at levels that exceed safety standards, which is 1 mSv per year for the radiation dose of the general public by processed products. Radon emanation found in several living goods, such as a natural latex, a mask, a sanitary pad, a health care instrument, construction materials and so on. Most types of the radon mitigation use the ventilation outside. This method causes some loss of the heat capacitance or air-conditioned air, which increase the operation cost of the air-conditioning system. Korea Research Institute of Standards and Science (KRISS) is developing a new concept of an active radon reduction system by an interworking technology with a highly sensitive radon monitor system and a ventilation system. We employ an electrostatic radon detection method and the radon detector counts an alpha emitting from the radon daughters (Po-218, Po-214, Po-216 and Po-212 from Rn-222 and Rn-220) with a silicon photo-diode. KRISS is developing a highly sensitive radon detectors, KRISS Rn-mini and Rn-trio, with a micro controller and own developed signal processing circuit. The electric field has been optimized by the 3D electric field calculation by finite element method. The mock-up model of the radon collection cell has been fabricated by the 3D printer and the sensitivity is found to be (31.0 ± 0.6) min^{-1}/(kBq/m^{3}) for the KRISS Rn-mini and (61.3 ± 1.1) min^{-1}/(kBq/m^{3}) for the KRISS Rn-trio. In this presentation, the development of the KRISS radon detector will be discussed.
