Gamma radioactivity on a chronosequence, Pinery Provincial Park, Ontario

Author:

VandenBygaart A. J.,Protz R.

Abstract

Natural gamma-emitting radionuclide distributions in soils along a time sequence on dune materials in Ontario were studied. 226Ra, 232Th and 40K showed distributions influenced by soil processes and their genesis. Chronofunctions were formulated relating gamma radioisotope properties within soil horizons to the ages of the soils. 40K tended to increase in relative concentration in the upper solum as compared with the Ck likely due to carbonate mineral weathering and removal. 226Ra and 232Th tended to accumulate in the B horizons possibly associated with sorption onto Fe-oxide and clay surfaces. However, more 232Th was retained in the solum relative to 226Ra due to the immobility of 232Th. Thus the 232Th/226Ra ratio holds potential for use in studies of soil weathering. The apparent accumulation of 232Th and 226Ra within the solum during 4700 yr of soil development and weathering suggests that these radioisotopes may remain within the soil profile for long periods. Key words: Radioisotope, radionuclide, soil genesis, 40K, 226Ra, 232Th, 137Cs

Publisher

Canadian Science Publishing

Subject

Soil Science

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