4)
ler
ioe C837 MALE
--- 5-15 YRS
ar
—— > i6 YRS
L
a
6
—
|
cc
ea
_.
2
ge
oa
-
id
-
—-
5
4--
So
c
=
10 14 18 22+
mpc/kg
= 10-
~ CoS?
a
6+
7
—_
—
7
LO 14 18 22+
muc/kg
—
18 22+
mpc / kg
a ee
9
'$8 22 26+
gmekg
-
14
ee
pee,
18 22 26+
gm / kg
RESIOUAL 3AMMA ACTIVITY
-
—
were
-
-
+
34
FEMALE
---5-15 *RS
— > 6YRS
~-Lw-f
=
anne i
0
10
MALE
72+ 5-0'1SYRS
— > |6YRS
PG
=
ar
aon
Qe bee
K
—
Ta
!:
ae
RADIONUCLIDES
7
i
r
,
muc/kg
-_-
i
Se
ou
2 16 20+
—
3
x
xX
8
myc kg
6
|
5
en
2 16 20
4
a
2
L_
I
28°
z &
EMITTING
--hy
———
8
GAMMA
tN RONGELA.'’ POPULATION
MARCH, 196).
ro
Tt
Ul
FEMALE
--= 5-15 YRS
—~>16 YRS
\
_
aro
a.)
")
— —
i
mp
=
IO
14
18
22
muc/ kg
4
|i2
20 28+
céms *g
4
12
20
28+
e/m/kg
Figure 37. Frequencydistribution of levels of radionuclides in various Marshallese groups.
cally significant. Also, females tend to have values
lower than those foundin the corresponding male
group (Figure 37). No significant difference between the Zn’ concentrations in the exposed and
unexposed groups could be determined. The percent variation within each group was approxi-
mately the sameas in the case of Cs'*’.
Potassium-40
The mean K concentrations for the vounger
Total Residual GammaActivity
The total residual gammaactivitylevels present
after subtraction of the above four spectra are also
shown in Table 17. The activity in cpm, kg has no
absolute significance. but is of value in indicatiny.
first, that there is some activityleft, and, second.
the nature ofits distribution by groups. Members
of the adult group have considerablyhigher levels
of residual activity per unit body weight than do
members of the juvenile group. No significant dil-
groups were consistently higher than those for the
corresponding adult groups. The male adult group
averaged 2.13 g/kg body weight and the female
adult group 1.63.
sex, or between the exposed and nonexposect
groups.
Cobalt-60
Radiochemical Analysis for Strontium-90
Analyses of the residual spectra obtained after
subtraction of the three above-mentioned photopeaks revealed the presence of a fourth photopeak,
The estimated 1961 Sr*® mean urinaryexeretion
in the Rongelap inhabitants was 7.20.4 wu |.
Co". The levels of Co’ were quite low (mean
=0.148 mpC,’kg), but were nevertheless readily
detectible. No significant differences between the
Co™ levels in the exposed and unexposed groups,
or on the basis of age or sex, were observed.
ferences were observed, however, on the basis «i
this represents a 14% increase over the 1959 valuc
(6.3 wuC,1). This value is based on theresults ot
analysis of a pooled 20.8-liter sample collected
from the adult population (see Table 18), This Sr’
urinary excretion expressed in terms of urinars
calcium is 30.6+3.9 uwC/g Ca. These values give