-15-
noted: w281,185 contributed the major portion of the radio-
activity in Scaevola leaves from Kusaie and in Messerachmidia
and Scaevola leaves from Ujelang
zn
(Lowman
t al. 1959), and
—
65 was predominant in fish tissues from Ponape and Utirik.
Co?’ was present usually in lesser amounts,
and co?8 ana C099
were found only in a sample of clam kidney from Ujelang and a
fish liver sample from Utirik.
Other radioisotopes were
present only in a few samples.
cs137,
in plants
for example, was found
from Kapingamarangi and Utirik,
a few samples from Kusaie,
cel41, 144_p,144 in
Ponape and Ujelang,
and mn>4 in
fish skin and gut from Ponape and clam kidney from Ujelang.
Pe? was detected once only,
in a sample of skipjack muscle
from Ponape.
The quantitative results of the gamma spectrum analyses
shown in Table 3 are based on analyses made approximately
eighteen months after the samples were collected; consequently
the shorter-lived radioisotopes Zr95-nb?°
Co?8
(71 days)
Rut93_pp103
(40 days)
(half life 65 days),
and cel4i
(32 days) had
decayed to insignificant or non-detectable levels.
Ina 16l-
DOF,ARCHIVES
gram sample of yellow-fin tuna from Ponape, however, Zr’”-Nb
were found in low amounts
(0.12 pyc/g at time of counting);
at time of collection the level of z2r95-nb95 would have been
40 pyc/g.
K49 was present in all samples analyzed.
In some
/¢