Prompt gamma-ray analysis (PGA) of meteorite samples, with emphasis on the determination of Si |
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| Authors: | Sk A Latif Y Oura M Ebihara G W Kallemeyn H Nakahara C Yonezawa T Matsue H Sawahata |
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| Institution: | (1) Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 192-0397 Hachioji, Tokyo, Japan;(2) Department of Chemistry and Fuel Research, Japan Atomic Energy Research Institute, 319-1195 Tokai-mura, Ibaraki, Japan;(3) Research Center for Nuclear Science and Technology, The University of Tokyo, 319-1195 Tokai-mura, Ibaraki, Japan |
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| Abstract: | Neutron-induced prompt gamma-ray analysis (PGA) was applied to seven meteorite samples (Allende, Zagami, Acfer 209, ALH77005,
ALH84001, EET79001 and Neagari). Samples were irradiated in both the thermal neutron and the cold neutron guided beams of
JRR-3M at JAERI. Multiple samples of an Allende standard powder were analyzed for Si using two different methods: (1) the
comparison method, using a Si standard, and (2) the mono-standard method, using Fe as an internal reference element. The Si
concentrations determined by these two methods are in good agreement with literature values. The analytical sensitivity for
Si using the cold neutron guided beam is∼14.3× higher than that for the thermal neutron guided beam. Other elements determined
(B, Ca, Ti and S) also showed higher sensitivities using the cold neutron beam. The other meteorites studied showed some anomalous
B and S values likely due to the effects of terrestrial weathering/contamination. |
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