Abstract
Four electrostatic radon monitors were constructed to continuously measure outdoor 222Rn concentrations at various locations. Outdoor 222Rn concentrations were measured at six locations in Japan and China. The annual mean 222Rn concentrations at Nagoya, Kasugai, Toki, and Kanazawa in Japan were 5.1, 6.0, 6.1, and 5.8 Bq m −3, respectively. The 222Rn concentrations at Nagoya, Kasugai, and Toki showed a diurnal variation clearly in autumn and a seasonal pattern of a spring-summer minimum and an autumn-winter maximum. The 222Rn concentrations at Kanazawa showed a diurnal variation clearly in summer. At Beijing and Fuzhou in China, the annual mean concentration levels were 7.0 and 11.4 Bq m −3 and the pattern of the diurnal variations was different from that at Nagoya. The seasonal variations of a summer minimum and a winter maximum were almost similar at Beijing and Fuzhou
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