Hematogical Effects on Heavily Irradiated Japanese Fishermen
65
STATE OF IRRADIATION AND ESTIMATED
RADIATION DOSE
N HEAVILY
SHERMEN
The fishermen were irradiated in the following 3 ways:
(1) From the radioactive materials adhering to the bodysurface.
(2) Externally from the radioactive materials deposited in the cabins, on
(3)
the deck ete.
Internally from the radioactive materials entering various organs.
The diameters of the fallout materials, which were the powders of coral-
reef fragments, ranged from 19 to 460 4, mainly 100 to 4Uu 4 (Kixucui et al,
1934). 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).
osion was performed by
: Pacific Ocean.
At that
iu” was located at about
s nearly 100 tons and 23
in fishing tuna they saw
on several minutes later.
-hich continued for ap-
internally deposited radioactive materials was difficult.
However, radiation from bedy 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
eturned to their mother
Table 1
Subject No.
wave been injured by the
‘d to the Tokyo Univer-
First National Hospital
1 both hospitals in May
‘mber 1954. After being
was possible on annual
of their occupations and
ible to get them all to‘d several times (Mivosut
ERIALS
's intensity was greatest,
Their foot-
*
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 ~699
200 ~250
220~270
520~570
k-2
K-3
K-4
K-5
K-6
K-7
K-8
K-9
K-10
K-11
K-12
K-13
K-14
K-15
K-16
130~180
140~190
120~170
140~190
180~230
230~280
220-~ 270
310~360
140~190
120~170
1900~150
256~ 300
420~500
140~190
120~170
200~250
230~250
190~240
220~270
300~350
340~390
380~430
550~600
230~280
170 ~~220
170~220
370 ~ 420
510~590
210~260
190~240
K-l
t al, 1956; Mryosur and
‘At and Kumatonrr, 1964.
eyes open.
allout.
The
specific activity of the material was 0.37 mCi/g on 23 Apnl. By extrapolation
of these data. a value of 1, 4Ci/g was obtained as the specific activity at 7:00
a.m. on 1 March. The estimation of radiation dose, especially that from
190~220
310~340
.
,
T-3 put the fall-out material close to his bed.
added in total.
Therefore about 100R shouldbe