Computer Science
Scientific paper
Jun 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..601v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 6, pp.601-606
Computer Science
1
Scientific paper
A series of soils originating from different rock types has been examined for their radioactive contents. The activities due to Ra 226 plus daughters, Th 232 plus daughters and K 40 were determined in 3 kg samples on a stablilized scintillation -ray spectrometer. The resulting pulse-height spectra were analysed by a least squares method using existing computer programmes. The purpose of the experiment was to determine the possible variations of activity in local rock types so that the radiation background could be computed. The results also form a basic datum for determining fallout from nuclear weapon tests in soil and some results are given for Cs 137 and Mn 54 to indicate the sensitivity of the method. The range of activities observaed in surface soil varied from 0.47-2.05 pc/g for Ra 226 plus daughters, 0.11-1.50 pc/g for Th 232 plus daughters and 0.46-9.7 pc/g for K 40 . The activities of fallout isotopes were of the order of 0.5 pc/g for Cs 137 and 0.2 pc/g for Mn 54. The distribution of activity with depth is given for some soils.
Gibson A. B. J.
Salmon L.
Vassilaki Maria
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