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The consequences have been assessed, in relation to human consumers of agricultural products, of a release of fission products from criticality excursions of magnitude 3 x 10l8 to lozo fissions in metal and liquid systems. It is concluded that exposure of children through ingestion of contaminated milk is unlikely to be a serious problem with excursions of magnitude less than 1020 fissions unless a substantial fraction of the fission product inventory is released to the environment. Hence, other agricultural products are likely to be of little significance. For an excursion of lozo fissions in a metal system, assuming vaporization and complete release of fission products, it might prove necessary to ban the consumption of milk within a radius of 10 km of the release if the emergency action reference level currently accepted in the U.K. of 25 rad to the thyroid gland is not to be exceeded.
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