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Accession number;99A0830391
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| Title;How Effectively is Activation Analysis Applied to the Returned Material from Space? |
| Author;
EBIHARA MITSURU
(Grad. Sch. of Tokyo Metrop. Univ.)
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Journal Title;Journal of the Mineralogical Society of Japan
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Journal Code:G0124A
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ISSN:0454-1146
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VOL.28;NO.3;PAGE.131-138(1999)
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| Figure&Table&Reference;FIG.7, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Neutron activation analysis (NAA) is one of the most sensitive methods for detemining concentration of elements. In NAA, two kinds of gamma-ray, prompt gamma and decay gamma-rays, can be used. NAA involving the measurement of prompt gamma-ray is called (neutron-induced) prompt gamma-ray analysis (NIPGA or PGA). There are two procedures in NAA using decay gamma-ray, instrumental NAA (INAA) and radiochemical NAA (RNAA). In this paper, each method of NAA including PGA is briefly described. In consideration of the extraterrestrial material to be returned from space by future space mission program, an effective analytical scheme is proposed both for the primary description and for the intensive study of chemical composition. Assuming that the returned material is small (say, smaller than mg-order), a practical procedure of INAA was examined by using cosmic spherules weighing less than 1 mg. The Allende powder sample prepared by the Smithsonian Institution was proved to be effectively used as a reference standard in INAA of small samples. (author abst.) |
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