Abstract
The effects of 60Co gamma radiation doses of 10, 50 and 100 Gy on Pediastrum boryanum (Turpin) Meneghini were followed over a 30-day post-irradiation period by means of periodic colony density measurements and the scoring of colony types at selected time intervals. A dose of 10 Gy had no significant effect on colony density or distribution of colony types. At 50 Gy a large increase in colony density began at day 14 accompanied by an increase in the number of eight-celled colonies. At 100 Gy a prominent delay in colony multiplication occurred, but once recovery began there was no overall growth stimulation even though the number of two-celled colonies recorded doubled. An attempt to determine the lethal dose revealed that colonies which had been exposed to 500 Gy showed no signs of multiplication after 52 days.
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