Cosmic-ray-produced40K and50V in the metal phase of chondrites |
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Authors: | Keiko Imamura Masako Shima Masatake Honda |
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Institution: | Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo Japan |
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Abstract: | Cosmic-ray-produced40K in the metal phase of six chondrites and50V in that of one chondrite were determined using a surface ionization mass spectrometer. The22Netotal/40Kmetal ratios of the chondrites are explained in part by shielding effects during cosmic-ray irradiation. The wide variation of this ratio in some groups of meteorites is explained in terms of partial loss of rare-gas nuclides. Radiation ages for the chondrites were determined using40K measurements and production-rate estimates from thick target calculations. |
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