Measurement of cosmogenic radionuclides in meteorites with a sensitive gamma-ray spectrometer |
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Authors: | G Bonino G Cini Castagnoli and N Bhandari |
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Institution: | (1) Istituto di Cosmogeofisica del CNR, Torino, Italia;(2) Istituto di Fisica Generale dell'Università, Torino, Italia;(3) Physical Research Laboratory, Ahmedabad, India |
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Abstract: | Summary A large-volume HPGe gamma-ray spectrometer in a NaI(Tl) well has been set up underground at 70 m.w.e. depth for whole body
counting of cosmogenic radionuclides in meteorites. The detectors are housed in a 20 cm thick lead shield with a lining of
cadmium and OFHC copper. The scintillator is simultaneously operated in anticoincidence as well as in coincidence in selected
energy channels to achieve low background levels (in the range of counts per day) and high specificity. In this way a large
number of radionuclides such as26Al,44Ti,60Co,22Na,54Mn, and shorter-lived nuclides produced in extraterrestrial materials like meteorites and lunar rocks can be analysed. Results
on Bouvante and Bereba achondrites and Dhajala and Torino chondrites are presented.
Due to the relevance of its scientific content, this paper has been given priority by the Journal Direction. |
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Keywords: | Cosmic-ray effects in meteorites and terrestrial matter |
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