20 tht! limits distant of dckection, from separation possible water the and more sensitive indicate in solution constant, that Bi by gamma–ray to 5.2 years for 60C0 P1’utonium-239, sistent ad If the ratios cell.ected at trations of 13 pCi/g in goatfis’n viscera a low concentration detection. were remained samples and by chemical wiil on for separation be a useful are tracer 30 years in excess in compared tracer (Table 12) in goatfish results from The presence at Bikini.” direct feeding. of 24.,000 years, viscera ingestion ~o in 1969 contained Nam 1. dry and 29 pCi.~’gdry. as compared of this with the radionuclide, The is con– of fine samples 239 viscera The se radionuclides a. long half-–life, of setiiment during particles it lagoon of t’ne lagoon. useful _nd 207 Bi a probably make in sediments, of selected w-ith.a half-life . 239,24(3PU would . 2s anot”ner potentiallyof of analyses it has chemical i:-.dication of transport Bismuth–207 19. f’ut-irebecause parts a strong spectrometry coi~pared in Table the 207 Bi ratios : or on particles. ‘would he samples, methods whiether transported The results particles. USe Cl, for samples of larger counting in different primarily 207 60C0 to determine would the method The use crater. and organisms ratios with of goatfish Pu in concen– absence of sediment merely below the limits 238 Pu reflects of