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Isotopic fractionation of tin under extremely strong centrifugal force field

Osawa, Takahito ; Ono, Masao ; Esaka, Fumitaka ; Okayasu, Satoru ; Iguchi, Yusuke*; Hao, T.; Mashimo, Tsutomu

Pure tin metals were centrifuged at 1,0200,000G and at 220$$^{circ}$$C for 100 hours, 400,000 G at 220-230$$^{circ}$$C for 24 hours, and 250,000G at 220$$^{circ}$$C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). 116Sn/120Sn and 124Sn/120Sn ratios of the 1,0200,000G sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6%. A three-isotope diagram of 116Sn/120Sn versus 124Sn/120Sn shows conclusively that isotopic fractionation caused by a gravitational field depended on isotopic mass.

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