Cad
co
Ae AREEO ie ny ap “ere ERP se RCNR
Concentration of plutonium isotopes in a coral section corresponding
TABLE 3.
to the growth year 1971-1972.
station B-3.
Coral taken at Bikini Atoll at
Noshkin et al., 1974
pCi/a, dry, + % error
2385,
wow ot
0.005 + 18
23942400,
0.13 +7
2405,
0.058 + ]
> REE-0 “UP ORETERER Tyeirene
1.5 + 6
Noshkin et al. (op. cit.) found the 23942405, concentration in the coral
averaged over the years 1968-1972 was 0.23 dpm/g.
2 IA ET
241,
The concentrationfactor
between the coral and sea water (for this same period) was estimated at 2,700.
Sakanoue et al. (1971) found .0042 d/m/g 23942405, in a coral taken from an
{sland near the Ryuku islands south of Japan.
If the plutonium (239+240) con-
centration in East China sea water (one of several also reported by Sakanoue)
is used to calculate a concentraticn factor, a similar value of 2,500 is
Oi tained,
4.
4.1
EXPERIMENTAL METHODOLOGY AND PROCEDURES
Collections and Preliminary Sample Treatment
An Ekman dredge and a 3-inch, inside diameter, gravity coring
cevice were used for the collection of surface sediments and sediment cores at
*** locations shown in Fig. 5.
The collections were made during October and
‘cverher of 1972 aboard the Puerto Rico Nuclear Center ship RMV R. F. Palumbo.
:. F. G. Lowman (Puerto Rico Nuclear Center), V. E£. Noshkin (Lawrence
-'verrore Laboratory), and W. R. Schell (Laboratory of Radiation Ecology) and
ieeer
ome mmegign
rmnet ae
merters of each of these principal investiagors' staff were responsible for
** sammole collections detailed in Tables 4
and 5.
Fror the surface of each grab sample, a 7-cm diameter by 2.54 cm deep
‘! ‘*2ical "core" (about 100 g dry weight) was removed for analysis as surface
“strent.
Although an attempt was made to collect sediment cores from every