現生および化石貝殻のウラン含有量および^<234>U/^<238>U放射能比
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概要
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Uranium contents and ^<234>U/^<238>U activity ratios in modern and fossil marine bivalle molluscan shells were measured by alpha-spectrometry. Uranium contents and ^<234>U/^<238>U activity ratios in modern shells were averaged to be 0.266 (dpm/g), and 1.18, respectivily and those in fossil shells were averaged to be 0.747 (dpm/g), and 1.19, respectivily. Uranium contents in fossil shells were obviously higher than those in modern shells. It can be explained by the addition of uranium to shell during the deposition. In fossil shells, ^<234>U/^<238>U activity ratio decreases as ^<238>U content increases the same tendency is not found in modern shells. The author proposed a mechanism of selective loss of ^<238>U from the fossil shelle for the explanation of this tendency. The hight activity ratio of ^<234>U/^<238>U measured on the fossil shells than that measured on the modern shells, also support the selective loss of ^<238>U from the fossil shells.
- 日本地球化学会の論文
- 1983-12-25
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関連論文
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- 現生および化石貝殻のウラン含有量および^U/^U放射能比 : 第2報 ^Thのα-recoil効果による化石貝殻の^U-^U-^Th (Io)の非平衡
- 現生および化石貝殻のウラン含有量および^U/^U放射能比