Measurements of concentrations and its ratio of radon decay products in rainwater by gamma-ray spectrometry with a low background germanium detector

None

竹安 正則 ; 飯田 孝夫*; 辻本 忠*; 山崎 敬三*

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

雨水中のPbおよびBiの個別濃度を低BGGe検出器を用いて測定した。その結果、Pbの濃度は、降水強度と逆相関にある場合があった。また、Pbに対するBiの濃度の比は、全ての雨に対して降水強度と弱い逆相関関係にあった。これらの関係は、層状性雲からのラドン子孫核種の除去モデルから得られる関係と同じであった。

The each concentration of Pb and Bi in rainwater was measured by a low background Ge detector. The concentration ofPb was a inverse relation with rainfall rate in some rainfall events, and the concentration ratio ofBi toPb 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.