-35ation from Rnto6 in the snail liver sample.
Although the
7
peaks for both Co?! and 99° are present in the
7
curves for
both samples, the peak for C08 is not present.
This is expected.
The C02? in the gamples would have passed through about 12 half
lives and would be present in insignificant amounts.
Mn on
the other hand, with a half life of 310 days would have gone
through only about three half lives and its .84 MEV
7
peak is
evident in the curves from both samples.
The .84 MEV peak of Mn°’ 1s easily confused with the .81
MEV peak of Co,
the
7
In those samples containing both isotopes,
peak from Mn24 can be detected only after the C028 has
been allowed to decay out as shown in Pig.10, or after chemical
separation.
Figure 11 shows 7
spectrum curves from three clam kidney
samples made 4, 18, and 31 months after the dates of collection.
The Coo! and 0° peaks are present in all three curves.
In the
curve analyzed 4 months after the date of collection the .81 MEV
6028 peak 1s very strong.
In the other two curves this peak has
decayed out and is replaced by the .84 MEV Mn>4 peak,
Representative whole
samples in which the 1.12 MEV
7
peak of zn°> has been observed include the following:
Organism
Date of collection
Site of collection
Whole fish
Nov. 8, 1952
Janet Is., Eniwetok
Pish skin
May, June, 1954
Belle Is., Eniwetok
Fish muscle
Fish bone
'
Fish liver
'