Photostimulated luminescence applicable to pre-screening of potassium-rich phases in chondritic breccias
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The identification of alkali-rich components in extraterrestrial materials along with their separation from other constituents is indispensable for subsequent cosmochemical and isotopic studies. This paper presents a simple pre-screening method for such materials by autoradiography using imaging plates (IPs), which is applicable to identification of mm-sized samples containing ca. 30 µg of potassium in the Yamato-74442 chondrite. The detection limit of IPs was ~1 mBq of 40K under 49 days exposure. The method provides an opportunity to screen meteorite materials non-destructively and to inexpensively check potassium-rich areas and are suitable for the 40K–40Ca and 40K–40Ar (39Ar–40Ar) age determinations.
KeywordsImaging plate 40K decay K-rich rock fragments Chondritic meteorites
We are grateful to the National Institute of Polar Research for providing the Y-74442 meteorite specimens. TY wants to thank H. Kusuno for her help during the course of IP exposure experiments at the Institute for Cosmic Ray Research. We thank M.J. Tappa for correcting and refining the English usage. Constructive comments from two anonymous reviewers improved and clarified the manuscript. This work was partly supported by funds from the NIPR Research Program (KP-6) and by the cooperative program (I02) from the Institute for Cosmic Ray Research and by the Sasakawa Scientific Research Grant from The Japan Science Society.
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