Hematogical Effects on Heavily Irradiated Japanese Fishermen
HEAVILY
{ERMEN
65
STATE OF IRRADIATION AND ESTIMATED
RADIATION DOSE
The fishermen were irradiated in the following 3 ways:
(1) From the radioactive materials adhering to the body surface.
(2)
(3)
Externally from the radioactive materials deposited in the cabins, on
the deck etc.
Internally from the radioactive materials entering various organs.
The diameters of the fallout materials, which were the powdersof coral-
reef fragments, ranged from 19 to 460 4, mainly 100 to 400 u (Kikucui etal,
1954). According to the results of radiochemical analysis of fallout on 26
March, rare-earth elements contributed about 50 per cent of the total radio-
activity and uranium contributed about 20 per cent (Kiuura et al., 1956).
ion was performed by
Pacific Ocean. At that
u” was located at about
nearly 100 tons and 23
1 fishing tuna they saw
0 several minutes later.
lich continued for ap-
turned to their mother
a\~ been injured by the
l to the Tokyo UniverFirst National Hospital
both hospitals in May
nber 1954. After being
' 9§ possible on annual.
ot their occupations and
ble to get them all to-
| several times (Miyosui1
al, 1956; Mryosni and
t and Kumatonrt, 1964;
RIALS
intensity was greatest,
y.S Open. Their footlout.
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
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 Estimated dose of whole body gammaradiation.
Subject No.
First Day
T-1
T-2
T-3
T-5
T-6
T-7
T-8
K-]
9A0-~290 R
210~260
Total
450~-500 R
390~440
150~—200
400~430
130~180
140--190
310~360
190~220
260~310* (360~410)
660 ~690
200~250
-220~270
520~570
310~340
140~190
120~170
140~190
180-~230
230~280
190~240
220—270
300~-350
K-8
K-89
K-10
K-11
220-270
310~-360
140~190
120~170
380-430
550~600
230~260
170~220
K-14
K-15
420~500
140~-190
510~590
210~260
K-2
K-3
K-4
K-5
K-6
K-7
K-12
K-13
K-16
;
130~180
230~280
100~150
250~300
120-~176
200~-250
340~390
170~~220:
370~420
190~240
* T-3 put the fall-out material close to his bed. Therefore about 100R should be
added in total.