Accumulation of Zinc-65 from Prolonged Consumption of Columbia River Fish

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Abstract
Fish caught downriver from the Hanford reactors were eaten once each week for more than 1 year in order to provide reasonable estimates of the quantity which might be consumed by persons living in environs and the associated intake of P32 and Zn65. In a 12-month period this amounted to about 25 lb of fish, 3000 nCi P32 and 800 nCi Zn65, The accumulation of Zn65 in the consumer was measured each week in a whole-body counter in order to trace the build-up and follow the seasonal trend. A maximum body burden of about 130 nCi Zn65 was reached on day 104 and again on day 310. After the initial build-up toward equilibrium, the body burden approximated seven times the weekly intake[long dash]more than anticipated from some published parameters. The reduction of Zn65 body burden following the last meal of Columbia River fish was observed for 511 days, indicating an effective half-life of 162 days.

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