Abstract
This report describes a nondestructive measurement on average burnup of irradiated fuel rods with use of a Ge(Li) detector. In order to obtain the average burnup directly and to simplify measurement and analysis, the γ-ray spectrum from the irradiated fuel rod was measured by scanning along the whole length of the rod. The total absorption peaks for the 0.662MeV (137Cs) and the 2.18MeV (144Pr) γ-rays were used in the analysis, and the peak areas were estimated by Covell's method. The absolute value of overqge burnup was determined by comparison of the peak area with that of a standard fuel rod.The accuracy of the nondestructive measurement is discussed on the basis of an accurate value from destructive analysis. The result shows that it is possible to give the average burnup with good accuracy when the ratio of the peak height for 137Cs to the Compton background is larger than about 1.5, that is, after about 1 year of cooling.
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