iv
LIST OF FIGURES
FiGUR coC
Major pathways to the production of long lived alpha emitting
PY
Approximate location of nuclear tests at Bikini Atol]
Ww
Generalized circulation of Bikini lagoon water in winter... ..
23
&»
Distribution of mean grain sizes of sediments in Rongelap lagoon .
27
wm
.......4.88-.6 .
Location of sediment collection sites
.. 1... 2... ewe eae
34
no
radionuclides at Bikini Atoll]
......
Schematic diagram of the allocation and processing of sediment
samples .... 2. cee ee ew eee hwo eww
38
Representative alpha spectra of a plutonium sample .....-. +s
49
Alpha spectra of a uranium sample
50
. 2. 2 2 se ee ee we we tee
Representative alpha spectra of a polonium sample
..-.. «+
Dependence of the absolute counting efficiency of the Ge(Li)
and Ge(Intrinsic) detectors with gamma-ray energy
......-...
YW
Areal distributions of 23942405, in surface sediments of
12
Areal distribution of °*! Am
13
Bikini Atoll] lagoon
2394240, ,241
2... 1 ee ee we we we ew we ee we eww
238
15
Areat distribution of
155
65
67
Eu and the activity ratio
2394240,155 Eu in surface sediments - . . 2. ©. ee e+ ee ee ee
69
Areal distribution of 'W37¢5 and the activity ratio
2394240, 137
Cs in surface sediments . . 2. 2. 2. s+ 6 ee © we we ewe
16
Areal distribution o ¢ 207 Bi and the activity ratio
2394240,
,207
Pu/"~
Bi in surface sediments . 2. 2. 2 2 0 ee ee ew ee
7
Areal distribution of
18
63
Pu and the activity ratio
2394240, u/238py in surface sediments .... 2. 2. 2. ee ee eee .
14
58
and the activity ratio
Am in surface sediments . 1... 2 2 «+ + 2 ee eevee
Areal distribution of
51
2394240
60
Co and the activity ratio
Puc, in surface sediments
. . . +. se ee ee ew ewe
Ordering sequence of the concentrations of radionuclides
in surface sediments by station
. 2. 6 6 0 ee ee eee eee ee
70