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Report No.

Measurements of Concentrations and its Ratio of Radon Decay Products in Rainwater by Gamma-Ray Spectrometry with a Low Background Germanium Detector

Takeyasu, Masanori ; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*

The concentrations and its ratio of Pb-214 and Bi-214 in rainwater were measured by $$gamma$$-ray spectrometry with a low background Ge detector, and the results were compared with the scavenging model of radon decay products from the atmosphere by precipitation. The each concentration of Pb-214 and Bi-214 in rainwater was constant and independent on precipitation rate for some precipitation events, and expressed with a power function of precipitation rate for the other events. The activity ratio of Bi-214 to Pb-214 was observed weak inverse correlated with precipitation rate. The measured ratio agreed fairly well with calculated one by the model.



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