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Radon Environment in the Korea Invisible Mass Search Experiment and Its Measurement
이명재,방형찬,김승천,김선기,이상준,Jin Li,명성숙,김영덕,김홍주 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.4
The level of radioactivity from <SUP>222</SUP>Rn in the air has to be monitored to control systematic effects on the background level at the KIMS (Korea Invisible Mass Search) dark matter search experiment. We designed and constructed a radon detector using a silicon photodiode that collects ^(218)Po and ^(214)Po daughter ions electrically and detects their α decays. Results for the detector calibration with a standard radon source, as well as the dependence of the -particle detection efficiency on the humidity, are presented. The radioactivity of radon at the YangYang underground laboratory is measured and continuously monitored.