SLIDE 59
Utirik summary. guse of the body-burden extrapolation equation leads us to the
conclusion that
~~Zn could have been the major contributor to the ingested
activity during the first years post-rehabitation of Utirik Atoll. This was
supported to some extent by a Japanese report (JCCRRER56) which indicated to
us a rise in the photon count rate at the surface of various types of tuna
retrieved from the Marshall Islands’ fishing grounds from March to August 1954
(100-10,000 cpm).
Fish with count rates greater than 100 cpm at the surface
were discardedby the fishermen.
prominence of
Radiochemical techniques indicated the
Zn in the tuna's edible flesh.
For committed effective dose equivalent, she impact of nuclides with a
short mean residence time in the diet (~~Zn,
Co) was greater at Utirik
because the population reinhabited within months of the BRAVO evens.
The
ippact of nuclides with a long mean residence time in the diet (
Cs
Fe) was greater at Rongelap because of greater initial contamination.
1954-2004 UTIRIK
PROTRACTED EXPOSURE
SUMMARY
Ba
Nuclide
Co
87Cg
8 7n
Sy
Fe
External
Total
.
50 Year Intake
Sv
Adult Mean
Committed Effective
Dose Equivalent
0.00044
54,000
860,000
5,200,000
1,700
1,900,000
Natural Background Subtracted
—
57
0.013
0.030
0.00010
0.00036
0.041
0.085
Sr,