Mass-dependent isotopic fractionation of a solid tin under a strong gravitational fieldTakahito Osawa1, Masao Ono2, Fumitaka Esaka3, Satoru Okayasu2, Yusuke Iguchi4, Ting Hao2, Masaaki Magara3 and Tsutomu Mashimo4
1 Neutron Imaging and Activation Analysis Group, Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
2 Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
3 Research Group for Analytical Science, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
4 Shock Wave and Condensed Matter Research Center, Kumamoto University - Kumamoto 860-8555, Japan
received 24 December 2008; accepted in final form 25 February 2009; published March 2009
published online 2 April 2009
Pure tin metals were centrifuged at 1106g and at 220 °C for 100 hours, at 0.40106g at 220–230 °C for 24 hours, and at 0.25106g at 220 °C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). 116Sn/120Sn and 124Sn/120Sn ratios of the 1.02106g sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.60.1%. A three-isotope diagram of 116Sn/120Sn vs. 124Sn/120Sn shows conclusively that isotopic fractionation caused by a gravitational field depended only on the isotopic mass.
47.57.ef - Sedimentation and migration.
67.80.dj - Defects, impurities, and diffusion.
66.30.Fq - Self-diffusion in metals, semimetals, and alloys.
© EPLA 2009