Abstract
Fundamental experiments on the nondestructive burnup analysis of UO2 were made by external conversion method using a sector type double focusing β-ray spectrometer. Details of the procedure are described. About 100 mg of UO2 enclosed in an Al-tube was irradiated and analyzed by this method. The fission products used as burnup indicators were 95Zr, 95Nb, 140La and 103Ru. A code for fission product calculation developed in our laboratory was used in burnup determination. The burnup thus determined was 53.07 MWD/t.
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