Hydration and Radiosensitivity

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Abstract
Artemia "eggs" (blastulae in suspended development) can tolerate about 200,000 r more X-irradiation in the hydrated than in the non-hydrated state, as determined by percentage hatching and motility at 48 hours. There is greater disparity between hatching and motility curves in the dry than in the wet state. Hatching requirements are less radiosensitive than those for motility. Depending upon the time of hydration before X-irradiation, wet eggs are variously radioresistant, showing a drop in tolerance immediately after hydration and a partial recovery of tolerance by 7 hours. Delay of one month between X-irradiation and hydration reduced hatching and motility values, the greatest disparity being at 300,000 r.

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