?
yates 86
LATE EFFECTS OF RADIOACTIVE’ 10 1INES
induced opacities of the lens noted in these
people as have becn seen in cyclotron work-
ers and the Japanese people exposed to the
bombs in Hiroshima and Nagasaki. However, the Marshallese people were not ex-
posect to any neutron irradiation, the rela-
tive
biological
effectiveness
of
neutron
radiation being much higher for cataract
formation.
One of the most important findings resulted from growth and development
studies of the children. These studies have
been carried out under the direction of
Dr. W. W. Sutow of the M. D. Anderson
Hospital. Extensive anthropometric meas-
urements and skeletal maturation studies,
using X rays of the hand and wrist for bone
age, have been carried out over the years
since exposure (11). It appears that there
has been retardation of growth in some
children, particularly boys exposed at less
than 5 years of age. The growth retardation
was most marked in two boys exposed 15
See
My
to 18 months of age. Figure 8 shows these
oS
PEER
Ce
RSiSa eee
two retarded boys. Figure 9 shows the lag
on
ren bri:
Ficure 8. Two 12-year-old boys showing greatest
growth retardation. No obvious mental retardation
in skeletal age in boys exposed at less than
was noted. pete : wiere
5 years of age compared with the unexposed
boys. In the females the lag was less marked. ” Rongelap people at 10 year postexposure.
I will have more to say about growth reDr. Herman Lisco and his group in Boston
tardation shortly.
(who are carrying out the chromosome
We obtained successful peripheral blood
analysis for us) tell me that alow prevalence
cultures for chromosome studies on the
of chromosomal aberrationsstill persists.
EMA
MALES
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=x
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iw
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.
t
,
.
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ae
a
eee EXPOSED
Pa
CONTROL
~~
-30
Y
~.
care eae
mo
ra
ae
0-20
“
Ore
378
AGE
6-8
U
0-2
AT EXPOSURE (YRS)
3-5
6-8
Ticure 9. Comparison of skeletal age (SA) and chronological age (CA), 1961 and 1962
(pooled datay.
PRIVACYACTMATERIALREMOVED
y TEellFerner
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