Abstract
Systematic measurements of fall-out in precipitation in Hradec Kralove, Czechoslovakia, during the past four to five years provided evidence that the activity of radioactive fission products from fall-out during November 1956 to December 1959 showed a trend similar to that in Norway. The peak of the activity in April 1959 was 3.960 mu mu c/l precipitation. The minimal value during November to December 1959 was about 20 mu mu c/l. The increase in activity of rain water in March 1960 after the first French nuclear test in the Sahara Desert on February 13, 1960, was very pronounced but transitory. Activity of fission products reached its highest level in the collection of rain water of March 1, 25.9 m mu c/l. In addition to the collection of rain water samples, the fall-out was collected every second or third day by the pot method. The data are presented in graphical form. (P.C.H.)
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