vi LIST OF TABLES Tabulation of announced nuclear detonations at Bikini Atoll... . 10 Concentrations of radionuclides reported in Bikini lagoon sediments .......0240808 a 30 Concentration of plutonium isotopes in coral collected at Bikini Atol] ........2.- cee ee ee ee ce ee es 33 Water depth, date, and methods of collecting surface sediments .. 35 ....... 36 ........ 458 Alpha particle energies and abundances of plutonium, uranium and polonium radioisotopes . . 1. 1. 1 ew we ewe we ew we ew ew we 4B Radioisotopes with alpha particle decay energies within 0.1 MeV of the decay energies of the radionuclides of interest ...... 52 Spontaneous plating of various radionuclides onto silver discs .. 53 10 Radionuclides whose presence in the final plated sample are unknown ww ww et tt tt Pr rr wee we ew ee «54 VW Energies of gamma-rays detected, from the radfonuclides measured, . 2... 2. 2 ee eee ee wwe wee we wee 56 12 Interlaboratory comparison of the concentration of gamma-emitting radfonuclides in environmental samples .. 1... eee ees oes 59 13 Distribution of 238, 234), 226 pn, and the radionuclide activity Water depth and date of collection of sediment cores el Interjaboratory calibration of by gamma spectroscopy 239,240 Pu standards ratio of 22695 /254y in surface sediments .....-2.2.06- ~.. 79 14 Distribution of unsupported 21055 concentrations in surface Sediments ...... eee. Ce ee ee ew we we ew te 81 1§ paeet (outfon of 238) 234) 235y and the ratios 238, to 235) and 35y and 234) to 238), with depth in sediment cores ........ 97 16 Distribution of 226, in sediment cores collected at stations C-3 and B-2 ww te tt et tte ee 98 17 Coefficients of variation of 239+240 Pu concentrations measured in subsamples of dried Bikini sediments 18 .......0e+0+80- 108 Within station variation of radionuclide concentrations te ee et www th we expressed as coefficients of variation 110