65
Hematogical Effects on Heavily Irradiated Japan
ese Fishermen
STATE OF IRRADIATION AND ESTIMATED
RADIATION DOSE
| N HEAVILY
‘SHERMEN
The fishermen were irradiated in the following 3 avays:
(1) From the radioactive materials adhering to the body surface.
(2) Externally from the radioactive materials deposited in the cabins, on
the decketc.
(3) Internally from the radioactive materials entering various organs.
The diameters of the fallout materials, which were the powders of coralreef fragments, ranged from 19 to 460 4, mainly 100 to 400 4 (Kixvcni et al,
1954). According to the results of radiochemical analysis of fallout on 26
March, rare-earth elements contributed about 50 per cent of the total radioactivity and uranium contributed about 20 per cent (Kimura et al., 1956). The
specific activity of the material was 0.37 mCi/g on 23 April. By extrapolation
of these data, a value of 1.4 Ci/g was obtained as the specific activity at 7:00
osion was performed by
e Pacific Ocean.
At that
aru” was located at about
S nearly 100 tons and 23
in fishing tuna they saw
ion several minutes Jater.
vhich continued for ap-
returned to their mother
have been injured by the
ed to the Tokyo Univer> First National Hospital
u both hospitals in May
ember 1954. After being
ar as possible on annual
of their occupations and
sible to get them all to-d several times (Miv
osw
t al, 1956; Miyosiy
and
HY and KUMATOonRI, 196
4.
“RIALS
Ss intensity was Ereate
st,
“yes open. Their foo
t-
Wlout.
a.m. on 1 March.
The estimation of radiation dose, especially that from
internally deposited radioactive materials was difficult.
However, radiation from body surface was large enough to cause skin
lesions.
External radiation dose was estimated as shown in Table 1.
The
exposure dose for 14 days ranged from about 170 to 690 R, and nearly 60 per
cent of these doses was received on the first day.
This estimation was based
on the results of the experimental reproduction of ash-fall, extrapolation of
decay curves of many places of the boat, and on detailed investigation of
Table 1
Subject No.
Estimated dose of whole body gamma radiation.
First Day
Total
T-1
T-2
T-3
T-5
T-6
T-7
T-3
240~290 R
210~260
150~200
400~-430
130~180
140~190
310~360
450~500 R
390 ~-440
260~310* (360~—410}
660 ~ 690
200 -~250
-220~270
520~570
K-2
K-3
K+
130~180
140~190
120~170
200~250
230~280
190~240
K-1
K-5
K-8
K-7
K-8
K-9
K-10
K-ll
K-12
K-13
K-14
K-15
K-16
190~220
140~190
180~230
230~280
220~270
310~360
140~-190
120~170
100~150
250~300
420~500
140~190
120~170
310~340
220~270
300~350
340~390
380~430
550~600
230~250
170~220
170~220
370 ~420
510~-590
210~ 260
190~240
* T-3 put the fall-out material close to his bed. Therefore about 100R
should be
added in total.