Effects of Radiations of Different LET on Artemia Eggs

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Abstract
Eggs of the brine shrimp Artemia salina in the dry state and, after soaking in water, for various times were irradiated with gamma-rays, 1-Mev electrons, and ions of helium, carbon, oxygen, and argon with an energy of 10 Mev/ nucleon. Sigmoidal survival curves with a multiplicity of the order of 60 are found with gamma-rays and electrons. The survival curves changed to exponential ones for irradiation with the heavy ions, the transition for dry eggs occurring between helium and carbon ions. For the heaviest ions, the effective cross section per ion approaches a maximum value of the order of 0.15 [mu]2. Soaking the eggs in sea water for periods up to 25 hours decreases the survival with heavy ions only a little but drastically changes the sigmoidal survival curve for electrons, reducing the multiplicity from about 60 to about 4. These changes on soaking are about the same at 6 hours and at 24 hours.

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