Table 17 represents the exposure rate at each pattern of activity as lisced
in Table 16 calculaced assuming 100% occupancy fer Rongelap Atoll.
Table :8
presents an estimate of the exposure rate fcr each age group, weighced by the
percent of time spent
in each area for
inhabicants of Rongelap Atoll based on
the Lawrence Livermore lifestyle Model (3.4 .
Summation of the exposure races in
each area provides che average exposure rates to che Rongelapese.
Using the average hourly exposure rates,
culated,
che long term external dose was cal-
These data, presented in Table 9 for Rongelap Atoll, have been cor-
rected for background (terrestrial and cosmic) radiation by using the average
exposure rate of Wotje and Afluk Atolls as a representative sample of she normal
Cunexposed) Marshall Island environment.
We feel that this {s a very conservative estimate for Rongelap Atoll since
the people rately visit the more heavily contaminated islands in the north, and
tend co restrict their "orher islands'' visits to the southern sector where exposure
tates are similar to that on Rongelap [Island itself.
This observation was supported
by an independent Living pattern assessment from which data became available in
the fall of 1977 (5).
Specific living pattern information for Rongelap was obtained on a field cria
in October 1977
(5)
This information its oresented in Table 20.
it should 5e
noted that as creviously mentioned, the Rongelap "lifestyle" involves very little
time away from Rongelap Island where a constane exposure rate of 7.3 JR/nhr is
Revised external dose oredictions based on the observed Rongelap Living
cattern
are g given in Tables 21,
:
22 and 22
These doses include corrections
£
2
assumed.
r
237 Cs and 60¢5 which are responsible for 209% of the coral
hvsical decay
ans
d for
P
external exposure rate above background.
The cesium and coba.c ratios vere cofained
using the averages of soil sample activities
Vniversity of washington ‘LRE)
t=
+
from analyses by 3NL (4°
and tre
- was assumed for this assessmen= <nac 710
radicnuciide loss nechanisms are operat::e other than physical decay.