external radiation dose was approximately 170-600 rad for I4 days,
about half or more being irradiated on the first day.
The dose to
each person differed depending on his behavior on the boat and the
position of his cabin.
The integrated dose to thyroid glands from 131 was inferred as
about 20-129 rad.
Urine samples which were collected at 4 weeks after
the explosion revealed signilicart amount of radioactivity.
However,
the radioactivity decreased rapidly, ¢.y. at about 6 months post
detonation the activity was barely detectable.
In the analysis al-cer
8 1/2 years and 10 years the levels of 3764 and 905, in urine were
the samic to those of normal Japanese.
At the same time the results
of whole body counting showed no significant difference between
fishermen and controls.
The radioactivity in several organs of the
fatal case was higher than controls, but low.
B.
1,
+
Clinical and Laboratory Findings
General symptoms and signs
Soon after the initial exposure most of the fishermen cxperienced
anorexia, fatigue, and lachrymiation, and in some cf them nausea and
vomiting occurred.
2.
Skin lesions
Skin lesions were caused by beta irradiation.
Shortly after the
exposure, they suffered from erythema which was followed by cdema,
vesicle, crosion, ulecration or necrosis.
in 20 cases, especially
2 cases who did not wear hats during ash-fall
revealed complete epilation,
These skin lesions were similar to
ordinary radiodcrmatitis nistolowically.
uradually.
Epilations were observed
The skin injries recovered
Ac present, namely 20 years after the exposure, ina few
cases depigmentation, pigmentation and capillary dilatation are observed.
Atrophy of cpidermis with narrowed stratum granulosum were clear
.
4
in histolugical section of these arca cxamined 10 years after the exposure.
3.
a.
Hematology
Leukocytes :
Total number of leukocytes decreased gradually,
- 90 -
7