COMPARISON OF ALTERNATE NONDESTRUCTIVE TECHNIQUES FOR THE DETERMINATION OF $sup 238$U REACTION RATE RATIOS.

Abstract

Note t h a t a1 though the 106 keV y-ray r e s u l t s from an energy transition between two excited s t a t e s of a plutonium nucleus (see Figure 3) i t i s referred to as a neptunium y-ray.Identification of a y-ray with the parent (Np) rather than the daughter ( P u ) nucleus i s a standard practice b u t i t does sometimes lead t o confusion.No such ambiguity e x i s t s when referring to X-rays since only atomic transitions are involved here with the i n i t i a l and final nucleus being one and the same. 3.Detection of the 2 3 9 ~p 106 keV y-ray and 2 3 9 ~u 103 keV X-ray via Ge(Li ) sing1 es spectrometry.The l a t t e r method i s a new approach and to the author's knowledge has never been successfully attempted previously.Two other possible sources of systematic experimental error were also investigated.The f i r s t , dealing with possible perturbations caused by the presence of cadmium in the l a t t i c e , was studied by comparing results obtained by direct 2 3 8 ~ cadmium r a t i o measurements to those obtained via the "thermal activation technique" which does not require a cadmium covered 2 3 8 ~ activation in the l a t t i c e .The second possible source of systematic error studied involved the use of fuel pellets inside the cadmium box in the l a t t i c e irradiation.

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