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‘ha absolute activity was extremely low and therefore of donbiful statice.
*
teal significance,
~—o-
dns betel
Vhe muscle in the terns contained levels of activity
--varying from 2.3 x 10* to 5.9 x10* d/m/kg, depending on the island oa
which the birds were collected,
The soft tissue of tern eggs had
atkageds
7x 10*to 8x 104 d/m/kg, while the shells showed no detectable activity.
Radioanalysis of a rooster caught on Rongelap Island indicated a
beta activity of 6.05 x 10° d/m and a gamma activity of 1.19 x 10° d/m
xetbeide dedeedi wu
(Table 4.5).
detonation.! The ratio of beta-to-gammaactivity in the rooster was
~~
) anae EEI pCO mee
1:2 at two years, as compared to 1:1 at one year post-detonation. About
86 per cent of the total activity in the bedy was concentrated in the skele-~
ton. The distribution of residual activity within the skeleton is shown in
the autoradiograph of the rooster tibia (Fig.1), The activity is diffusely
spread throughout the diaphysis. The concentration of activity in the
diaphysis and its absence in the ends of the bone indicates that the primary deposition occurred soon after the detonation while the chickens
were young and growing, The radiation dose to the skeleton from the
internal emitter is obviously considerably higher than that to any other
tissue, The muscle contained 8 per cent of the beta activity, and the
liver, 4 per cent, The gastrointestinal tract had 1.3 per cent of the
beta activity, and about one fourth of this was found in the respiratory
TOD an abs Ser peer rapaneee c
tract. The relatively higher levels of activity in the gastrointestinal
tract as compared with the respiratory tract suggest that ingestion was
the primary route of current entry of the fallout material into the body,
The average activity for individual tissues of four rats collected on
Rongelap are presented in Table 4,5. The rats had a beta activity of
0.095 pc/kg body weight.
0.12 pc/kg body weight.
This is very close to the activity of the rooster,
The distribution of activity in the tissues of the
rat differed from that in the rooster in that the skeleton and head together
contained 65 per cent of the total beta activity, while the gastrointestinal
tract had 24 per cent. The distribution of residual activity in the rat
skeleton is illustrated in the autoradiograph of the femurs of the four
rats, Fig.2, The activity is diffusely spread throughout the bone,
.
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Bee
The level of beta activity of this rooster was 40 per cent
of that of a rooster from the same locality analyzed at one year post-
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