Abstract
The effects of a single exposure to 2-MeV fast neutrons were compared with the effects of exposure to60 Co γ-ray irradiation on dry eggs of Artemia. Comparison of the survival data showed that neutrons were 2.1, 2.8, and 4.8 times as effective as γ-irradiation in producing mortality of nauplii at 1, 2, and 3 days after hatching. Irradiation with fast neutrons produces severe chromosomal abnormalities and leads to a depression in mitotic activity. On the basis of the cytological observations, the relative biological effectiveness of fast neutrons was about 2 with reference to γ-rays.
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