RADIOACTIVITY IN MAN
261
hundredfold. However, it’ appears from spectrographic analysis
in 1959 that equilibrium of body level with environmental contamination for the two gammaemittingisotopes has been attained.
The levels of 0.57 wc Cs” and 0.44 nc Znpresent in 1959 represent only a small percentage of the maximum permissible dose
1000 EF
C
E
i
i
TTT
Cs'57_)
T+
NET IN VIVO GAMMA-RAY
SPECTRA OF MARSHALLESE 1]
SUBJECT (NO.7S)MALE,
AGE 44
|
T
zn®*
im
z 'OOF- march 1959
S
- CHANNEL WIOTH
x=
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us
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20 key
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7
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-
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MARCH 1957
CHANNEL WIDTH
1OL_
4
50 kev
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|
1.20 140 160
Figure 9. Gamma ray spectrograph of Rongelap man in March of 1957 and
March of 1959 before and after his return to Rongelap.
(see Figure 10). Sr excretion rates increased by a factor of about
twenty duringthe first year after the return of the Rongelap people. Analysis of bone samples of an exposed man who diedafter living on Rongelap about eight months showed 3.7 pyc Sr“Gm, Ca.
Further slight increase occurred during the following vear as evidenced by urinary excretion increase of from mean values of 3.2
puc/1, to 5.7 wyc/l.
(Based on an estimated body burden of
002 pe Sr™ after a return of one year, the following year's value