Journal of Nuclear Fuel Cycle and Waste Technology

Combined method of extraction chromatography and liquid scintillation analysis was established for determinating 55Fe and 63Ni radioactivity in solid samples. Activated concrete wastes generated from dismantling KRR-2 were analysed. The sequential separation including precipitation and extraction chromatography resulted in the above 90% chemical recoveries of Fe. Above 60% recoveries of Ni were obtained by this procedure exception to 43.6 and 46.5% recoveries. The seperation and counting procedure was also confirmed with spiked samples of known quantity. The measured and spiked quantity were agreed with the 3.7% and 0.7% variations in the 55Fe and 63Ni experiments, respectively. The radioactivities of 55Fe in the dismantled concretes are shown from below MDA to maximum 361 Bq/g. The radioactivities of 63Ni in all concrete samples are below MDA. The 63Ni doesn';t exist in dismantled concretes from KRR-2. The radioactivity of 55Fe is decreased rapidly as the sampling depth is increased from the concrete surface.

Keywords

55Fe,63Ni,dismantled concrete,extraction chromatography,LSC