Abstract
The weathering effect over several years for Cs/sup 137/ deposited on a number of types of soil was measured and the observed reduction in dose-rate was correlated with the measured distribution of activity in the soil. The results showed that at the time of sampling (4.8 years after deposition) about 50--80% of the activity is contained in the top 5 cm of soil. After 4.8 years the gamma- dose rate at 50 cm above a small area of soil on which Cs/sup 137/ has been deposited is between 55 and 73% of the initial dose rate for eighteen plots of five different soil types, the average values for the individual soil types lying between 60 and 68%. There was little significant difference between the movement of the activity in the different soils. (P.C.H.)
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