High-precision measurement of 234U/238U ratio by thermal ionization mass spectrometer equipped with a WARP filter
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概要
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High-precision measurement of 234U/238U isotopic abundance ratio was carried out for three uranium samples, separated from a lake sediment and two zircon specimens. The thermal ionization mass spectrometer used has nine new bucket-type Faraday collectors and a Daly ion-counting system detector positioned behind axial Farady and WARP filter (a kind of energy filter). The WARP filter is designed to suppress the tailing effect of adjacent strong ion. The aberration of the measured ratio from the theoretical ratio was as small as 0.02%, for a zircon from Finland. A 0.20% excess of 234U in the lake sediment is judged to be reasonably significant. The amount of uranium used is of the order of 200-300ng, and the measuring time required is 80 minutes as a whole. Half-life of 234U is evaluated to be 2, 44416×105y.
- 日本学士院の論文
著者
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Masuda Akimasa
Department Of Chemistry Faculty Of Science The University Of Tokyo
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SAHOO Sarat
Human Radiation Environmental Division, National Institute of Radiological Sciences
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MASUDA Akimasa
Department of Chemistry, School of Science, The University of Tokyo
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