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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 each concentration of $$^{214}$$Pb and $$^{214}$$Bi in rainwater was measured by a low background Ge detector. The concentration of$$^{214}$$Pb was a inverse relation with rainfall rate in some rainfall events, and the concentration ratio of$$^{214}$$Bi to$$^{214}$$Pb was a weak inverse relation with rainfall rate in all rainfall events. These relations were the same as these obtained by the removal model of radon decay products from stratiform cloud.



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