Miniature pigs were exposed unilaterally to mixed gamma-neutron radiations from the AFRRI-TRIGA reactor delivered in a single pulse. Seventy-one miniature pigs received midline tissue doses ranging from 183 to 335 rads. The${\rm LD}_{50(30)}$ was 218 rads. Survival times ranged from 10 to 22 days, and the mean survival time for all decedents was 15.1 days. Clinical symptoms and pathological changes are reported.

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