Analytical results of physics specimens and dosimeters in fuel pins, 1, 2, and 4 irradiated in the Dounreay prototype fast reactor

The United States and the United Kingdom have been engaged in a joint research program in which samples of higher actinides were irradiated in the 600-MW Dounreay prototype fast reactor in Scotland. Three separate fuel pins (FPs) were prepared and irradiated. The actinides in FP-1 and FP-2 were irradiated for 63 full power days (FPD). The irradiation of FP-4 was carried out over a longer period (492 FPD) and should provide the best estimate for cross-section and fission-yield measurements made to date. This report presents the analytical results using mass spectrometry and radiometry for the actinides and the primary activation products for the three FPs. This report also details the fission-product yield measurements for samples of FP-4 by gamma-ray assay techniques with selected results from similar measurements previously obtained for FP-1 and FP-2 samples.