Abstract
Two-year-old Pinus banksiana seedlings were exposed to gamma radiation to study the effect of dose rate and total dose received. The plants were grown in pots out-of-doors under similar environmental conditions. A control treatment plus 17 radiation treatments were used, with total doses ranging from 2 to 18 Gy and dose rates from 3.7 to 46 mGy/hr. Seedling stem growth was inhibited at the higher doses, and was inversely correlated with total dose and dose rate. Dose-rate information significantly improved the ability to predict reduction in stem growth over the use of total dose alone. The resulting multiple regression equation provided predictions that were consistent with literature data from other Pinus species.
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