New U/Pu metallic spikes for safeguards accountancy measurements at reprocessing plants
A new generation of metallic uranium/plutonium spikes has been developed for U and Pu determinations in undiluted input solutions of reprocessing plants. The Pu spike is in the form of a Gd-6%Pu-0.16%Nd (mass%) alloy disc prepared by levitation melting. This gadolinium provides a ductile matrix in which the Pu is present in solid solution. The alloy has good oxidation resistance, but is readily soluble in the nitric acid medium of the input solution. The neodymium addition is to permit a determination of input tank volume via the measurement of (142/143)Nd ratios. The U spike is a metal disc with a (235)U enrichment of 19.9%. A gamma-counting method of plutonium homogeneity control was developed using a Monte Carlo simulation to correct for gamma-ray self absorption. The spikes were certified for uranium and plutonium mass fractions and amount ratios as Isotopic Reference Material (Spike) IRMM-1030.
Bibliographic Reference: Paper presented: International Nuclear Target Development Society 18th World Conference, Strasbourg (FR), October 7-11, 1996
Availability: Available from (1) as Paper EN 40240 ORA
Record Number: 199710019 / Last updated on: 1997-02-26
Original language: en
Available languages: en