30
the concentration of seven gamma-emitting radionuclides in "mid-lagoon" and
Bravo Crater sediments collected in August, 1964.
Beck et al. (1967) reported
roncentrations of three gamma-emitting radionuclides in Bravo Crater sedi-
ments taken in May, 1967.
Held (1971) reported 20735 and plutonium concentra-
tions in a Bravo Crater sediment collected in 1969.
The concentrations of
selected radionuclides reported in these reports are shown in Table 2.
Held's
vor). also noted the presence of a large variation in the ratio of 2394240 Pu/
23e in Bikini soils, with ratios of 15:1 in Bravo Crater sediment, 2:1 in
fneran Island soils and very high ratios in Bikini Island soils, due to undetectable 2385, levels, “although they contained the highest concentrations
of 039+2405 of th> samples analyzed."
TALE 2,
Concentrations of radionuclides reported in various Bikini
Lagocn sediments.
Location
pCi/a, dry, at date of collection
Mid-lagoon
Rate
Co
19648
3.2 - 10
eee
cs
1964°
100 - 390
0 - 2.1
0 - 0.15
PT Bi
230-3302
28-170
0.29 - 1.4
ohy
0
-
o: vu
110 - 250
.
é. helander (1967); n=2
.
Bravo Crater
19675
49.7
14.8
26.1
-
.
b. Beck et al (1967)
1963¢
-
-
56.8 - 53.5
60.
4.0
cc. Held (1971)
he's (unputliched results) measured the distribution of
gross beta radioa
se
wows
7
“YT
‘* sections of ten sediment cores taken from Rongelap Atoll in 1959.
te"
tye
cor-s, the gross beta radioactivity decreased from values ranging
~
s
o
8
.
‘c lle e/r/g, dry, in the surface one inch of sediment, to values
«Be %e
“ston, Or to 2.9 c/m/g or less, in the 4-5 cm section.
Three of
- Ciret
Ge
had“ one value higher than 2.9 c/m/g in a section deeper in the
.
"er
nt
‘erved radioactivity oricinated from the local fallout of the