listed in Table 11. The doses are presented by
pathway and radionuclide so the contribution of
each pathway and nuclide can be evaluated.
Since that time, we have
measurements inside and outsidd@
fmade specific
of houses and
around the village area to definelmore precisely
the average external effective dose a resident
The 30-, 50-, and 70-y integral effective doses are
0.0059 Sv (0.59 rem), 0.0082 Sv (0.82 rem), and
0.0097 Sv (0.97 rem), respectively. The same
information for the local foods only diet (IUA)
are listed in Table 12.
The doses calculated in this report are less
than those calculated in 1982 (Robison etal.,
1982) because of the concentration now used for
drinking coconut and copra meatversus that used
in 1982 (see discussion on page 16), and because
the internal gamma dose calculation now
accounts for shielding by buildings, etc. In 1982
we used the average open-air gamma exposure
with no adjustments for shielding and the
would receive. The comparativd results of the
1982 estimated effective dose anf
the effective
dose estimated in this reportfare listed in
Table 13.
The effective doses presegted here for
Rongelap Island could be reduceli even further
based on experiments conducted ft Bikini Atoll;
the use of high-potassium fertifizer at Bikini
has reduced the 137Cs uptake in [food crops by
about 90 to 95%. Consequently,iif is possible to
reduce the 137Cs doses from inggstion listed in
Tabie 11 and 12 by a similar argount if some
mitigating, salutary measures are
amount of time people spent in variouslocations.
Impiemented.
Discussion
Comparison of Estimated Doses to
to a population is 1 mSv y-1 (1€0
Background Doses
Island is 0.0059 Sv {0.59 rem).
Adopted
Guidelines
and_
to
The maximum annual effective dose for
Rongelap Island in 1995, using average values
for
parameters
in
the
mrem y-!).
The 30-y integral effective doselfor Rongelap
(3.0 rem).
Additional perspective can
comparing these estimated do
dose model, is
0.26 mSv y-! (26 mrem y—!) when imported foods
are available. By way of comparison, the
current guideline adopted by most government
agencies for the average annual effective dose
guideline for
obtained by
Table 11. The 30-, 50-, and 70-y integral effective dose for RongelapIsland residents w
foods are available (LA).
Integral effective dose, Sv (rem)
Wy
External
50 y
70y
0.0024 (0.24)
0.0033 (0.33)
0.0039 (0.39)
0.0033 (0:33)
8.7 x 10-5 (0.0087)
1.3 x 10-5 (0.0013)
1.4 x 10-5 (0.0014)
0.0045 (0.45)
1.3 x 10-4 (0.013)
3.3 x 10-5 (0.0033) 3.3 x 10-5 (0.0033)
0.0053 (0.58)
1.5 x 10-4 (9.015)
6.0 x 10-5 (8.0060)
5.7 x 10-5 (8.0057)
7.0x 10-5 (0.0070)
4.5 x 10-5 (0.0045)
1.3 x 10-4 (9.013) .
7.8 x 10-5 (§.0078)
0.0082 (0.82)
0.0097 (0.9%)
Internal
Ingestion
137Cs
90Sr
239+240 Py
241Am
Inhalation
239+240 Py
241Am
Totala
2.9 x 10-5 (0.0029)
‘1.9 x 10-5 (0.0019)
0.0059 (0.59)
a The total dose may vary in the second decimal place due to rounding.
30