Determination of halogens in meteorite and geological samples by radiochemical pfoton activation analysis.

Accession number;99A1008002
Title;Determination of halogens in meteorite and geological samples by radiochemical pfoton activation analysis.
Author; LATIF A (Tokyo Metropolitan Univ.) OURA Y (Tokyo Metropolitan Univ.) EBIHARA M (Tokyo Metropolitan Univ.) NAKAHARA H (Tokyo Metropolitan Univ.) OHTSUKI T (Tohoku Univ.)
Journal Title;Abstracts of Papers. Symposium on Radiochemistry
Journal Code:F0139B
ISSN:1345-2762
VOL.43rd;NO.;PAGE.87(1999)
Figure&Table&Reference;
Pub. Country;Japan
Language;English
Abstract;In order to precisely determine halogens in meteorite and geologicalsamples, we have developed a radiochemical photon activation analysis(RPAA) procedure which allows us to simultaneously determine four halogens in a single sample. Powdered samples and reference standards were simultaneously irradiated for 2-6 h at an electron acceleration energy of 20 MeV and 30 MeV by the 300 MeV electron linear accelerator of Tohoku University. The samples were subjected to radiochemical procedures for halogens immediately following irradiation. The time required for the chemical separation of four halogens is about 50 min. The average chemical yields were -60%, -75%, -70% and 60% for F, Cl, Br and I, respectively. The detection limits obtained by this method under present experimental condition for F, Cl, Br and I are -91 ng/g, -8.8 .MU.g/g, -0.3 .MU.g/g and -15 ng/g, respectively. The halogen data for the meteorites and terrestrial rocks studied here are in agreement with 'good' literature values. (author abst.)
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