Abstract
Most of the activity is due to members of the thorium and radium series. There is a factor of 20,000 between the most active and least active foods. The most active food so far measured is the Brazil nut; breakfast cereals have the next highest alpha activity. In general, values in milk products, fruits, and vegetables are low. The alpha activity seems to increase with the phosphorus content of foods. In general, an adequate diet will not contain less than 2 x 10/ sup -12/ c of alpha /day. (auth)
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