View More View Less
  • 1 Kyoto Prefectural Institute of Hygienic and Environmental Sciences 395-Murakami-cho, Fushimi-Ku 612 Kyoto Japan
  • 2 Government Industrial Research Institute Nagoya, Hirate-mach, Kita-ku 462 Nagoya Japan
Restricted access


Data of variations in the RaB/214Pb/ and RaC/214Bi/activities in precipitation obtained from observations made for a period of almost 5 years are given together with data on changes in precipitation rate measured simultaneously. It is concluded from analysis of these data that the precipitation rate variation contributes to approximately 40% to the seasonal variation in the specific activity of precipitation.