Abstract
The temperature of evolution of fission product 86Kr from the inside surface of reactor canning material during controlled post-irradiation heating has been shown to agree to within 25 °C with the irradiation temperature, estimated by more direct means. The temperature found in this way is the maximum temperature of the specimen during the last period of the irradiation where this period is of the order of the time for half the atoms in the specimen to be displaced by the high energy particle flux in the reactor. The accuracy of determining by this method a maximum temperature set by a temperature excursion in the laboratory and found by a subsequent temperature rise experiment, has been shown to be ±7 °C.
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