Abstract
Beta-particle emitters present in the snow of polar ice caps which are being analyzed for dating purposes, are due to fission products from thermonuclear tests in the atmosphere ( 90Sr, 137Cs) and to natural radioactivity. The measurement of many snow samples containing these radio-isotopes was made possible by the use of an automatic sample changer located inside a nuclear shielding. For detection, a surface-barrier silicon diode is connected in anti-coincidence with a gas-flow detector. The background radiation reaches 5 counts per hour (cph) above the energy of 120 keV and the efficiency for 40K is 33%. The nuclear detection characteristics are studied in detail.
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