Abstract
Abstract Background levels of226Ra on non-cultivated soils in Canada (in southern and northern Quebec and in the North-West Territories) are presented. The activity of226Ra was measured at 34 sites. The specific activity levels ranged from 4.4 to 56.4 Bq/kg with an overall mean of 19.1±12.8 Bq/kg. This activity generates an annual absorbed dose in air of 0.07 mGy. The activities were found to be approximately lognormally distributed with the median activity equal to 15.4 Bq/kg. The activity of226Ra in the soil does not change with the depth. There is a significant difference between Ra concentrations in soils in all three regions studied.
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