SLIDE 59
Utirik summary. yse of the body-burden extrapolation equation leads us to the
conclusion that 6 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 discarded, by the fishermen.
prominence of
Radiochemical techniques indicated the
~~Zn in the tuna's edible flesh.
For committed effective dose equivajent, fhe 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 event.
TES
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
Nuclide
Co
87Cg
87H
Sr
Se
External
Total”
Bq
Intake
Year
50
.
54,000
860,000
5,200,000
1,700
1,900,000
.
Natural Background Subtracted
_
57
Sv
Adult Mean
Committed Effective
Dose Equivalent
0.00044
0.013
0.030
0.00010
0.00036
0.041
0.085
Sr,