12
Ocean in 1954.
Fourteen of them were examined
under hospitalization, and the other four were
treated as outpatients. At first we planned to
examine all the exposed persons (twenty-two in
normal, although neutropenia, lymphopenia, eosinophilia and slight basophilias were observed in
one or two cases respectively. N. AP-ase-score
decreased in one case. Bone marrow exami-
total), however, mainly for reasons of their own,
nations revealed slight increase of myeloblasts
we could not include four of them in the 1964
survey,
and M,E ratio in Cases T-3 and K-12 respectively. “Mfitotically Connected Abnormalities ~
were found in a few cases. In view of these
findings, it could be indicated that there is some
residual effect of radiation exposure on haematupoiesis on these persons.
Chromosome observations of peripheral leucocytes were made in 13 cases. The average rate
of chromosome aberrations was much higher than
In general, these persons had been in good
health during the past years.
Although several
diseases occurred in some of them, there was no
definite reason to relate the radiation exposure
to such diseases. Since most of them got children after being discharged from hospitals, it
would seem evident that permanent sterility did
not occur in them.
The routine physical examinations of
196+
revealed that liver was palpable in ten cases.
However, it was not cirrhotic, and did not seem
to be related to liver disturbances. The routine
physical examination had no observation to be
relatable to the radiation exposure.
Residual beta burns of the skin were noted in
13 people of the 18 examined.
The burns were
observed in wrists, external ears, abdominal walls,
foot and leg. Most remarkable ones were those
seen in abdominal walls.
Skin biopsies of the
abdominal walls were performed in six cases.
Histological diagnosis as well as macroscopic
examination of these lesions indicated no malignant change. In one case that showed complete
epilation at the time of the accident, a small al-
opecic area wasstill noted in the scalp.
Ophthalmological studies revealed lens opacities in 6 cases, in which 2 cases showed opacities
of posterior capsules. However, these changes
had not characteristic features described about
that in the normal. The frequency of aneuploid
cells was higher, and chromosome-type abnormalities such as dicentric chromosomes and monocentric abnormal chromosomes were frequently
observed. Cells with dicentric chromosomes occurred in 7 cases, and those
with
monocentric
abnormal chromosomeswerepresent in all of the
cases. To trace the fate of such cells with chromosome abnormalities persisting in them seems
to be necessary in the succeeding annual inves-
tigations.
There were some abnormalfindings in different
laboratory studies. However, it was not proved
that radiation exposure was related to these results.
Whole body counting and determination of
urinary excretion of '’Cs and "Sr were carried
out. No significant increase of '’Cs or Sr was
found on the exposed persons by the examina-
tions.
In general, the results of 1964 medical survey
on Japanese fishermen did not indicate clinically
progressed cataracts of atomic bomb survivors
significant late effects of the fall-out exposure in
in Hiroshima, although lens opacities of 2 cases
1954. However, it seems to be very important
as well as necessary to conduct further medical
survey to detect the significance of subtle changes
were found in posterior. Further ophthalmological survey should be needed.
Haematological survey showed that the results
of peripheral blood examinations were almost
such as observed in haematological, chromosomal
or ophthalmological examinations.