Decay time

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The radioactive fission products in the fuel resulting from nuclear fission are the reason for the high initial radiation intensity and the heat generation of the fuel after its use in the reactor. Heat rate and activity of the irradiated fuel initially decrease rapidly due to the large share of short-lived radionuclides. The activity contained in irradiated fuel decreases to approx. 1/100 of the original value within one year of removal from the reactor.

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