30
Isotope
Observed
vercent
gr?
Fxpected
percent
Ratto observed rercent
expected vercent
8.8
8.2
1/1
Rut?3: 106 pnt?
12.9
18.0
19.5
1/1
cath thy pri’
26.0
13.2
2/r
Triv. BLE,
pal
3.1
5.7
10.8
3/1
1/t
In addition to the great individual variation, differences
were also observed in the total éemount of activity accounted for.
At stations 9C and 9D, both of which are within 45 miles of Bikini Atoll, only about 80 percent of the total beta activity was
eccounted for as fission products.
On the basis of & gamma snec-
trum run on sample 9D shout § percent of the total gamma activi-
ty was 2n©>,
other hand,
On the
in the gemma spectrum curve of plankton from station
8C. €5 miles
6
No evidence of cobalt tsotopes was found.
)
northwest of Bikini, the non-fission product iso5
topes C57 OP an®: and voseitly Co-!* , €ccounted for more than
50 percent of the total camma activity on November 26, 1956**.
(Pig. 10).
Of the Marsh sam;les, chemical separations for fission products and zine and cobalt were made on plankton from stations 5,
42 and 55 (Table 6).
DOE ARCHIVES
*
The chemigg1 and resin column data indicate the possible
presence of Co”'.
The gamma spectra male on the separations,
however, indicate that the isotope is V49 rather than Co? .
se
The techniques employed for identifying the different co-
balt isotornes involve the'use of chemiatry, ton exchange resin
columns, beta energy determinations, and gamms& spectrometry.
The technigquee and results obtained for various biological sampies will be published in s later paper.
us