Abstract
The fission-product gases released from a sample of uranium dioxide during irradiation in a capsule to 4.1 × 10 20 fissions/cm 3 in the Windscale advanced gas-cooled reactor (WAGR) have been measured continuously. The steady-state release rate was principally due to knock-out from the fuel surface and showed a strong dependence on isotopic half-life, in good agreement with theory. Occasional bursts of release of long-lived gases were detected, the quantities of which lend support to current theories of the mechanism of stable fission gas release. The release rates of gaseous fission products were also measured in an atmosphere of reactor coolant gas.
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