@ x to be the major gamma emitting contaminants. , ' aa These were present in Cs/Co 1 | . ratios of approximately 25/1, 50/1, and 30/1 respectively for the three ‘samples, and thus the projected exposure rate decay will very closely approximate the decay of 127es, In addition, ?9Sr was present in amounts ranging from 10-50% of thel3’cs concentrations.