tor of 3.
However, the population distributions illustrated a maximum factor of
> times th: mean activity ingestion rate value.
Dose equivalent rates post return were determined for members from both
atolls.
For Rongelap Atoll, the residents received approximately 100-200 mRem
per year during the first 5000 days post return from internal emitters.
principle contributing nuclide was 13265.
For Utirik Atoll, the residents
received !0-15 Rem per year during the first 400 days post return.
contributing nuclides were 6525 and 6004.
The
The major
Dose equivalent rates to the
Utirikese from internal emitters fell below 500 mRem per year at approximately
1200 days post return.
The dose equivalent for population sub-groups and for individuals was determined.
row,
Table 6 summarizes the results for the total body, thyroid, red mar~
testes, ovaries,
lower large intestine wall and the liver.
The catenary
compartment model of Bernard and Hayes (Ber70) was used to determine doses to
various segments of the gastrointestinal tract.
.
oa.
oe
significantly more radiation dose from
65
“Zn,
60
The Utirikese received
Co, and
55
.
Fe than did the
Rongalapese due to the short mean residence times of these nuclides in the envi-
ronment.
90
.
Sr doses to the Rongalapese were 2.5 time greater and
1.5 times greater than doses received by persons at Utirik.
137
Ca doses
This occured even
though Utirik residents returned to their atoll 3 years earlier and it reflects
the degree to which Utirik was less contaminated than Rongelap.
26