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4.2 Internal Dose - LawrenceLivermore National Laboratory
Lawrence Livermore attacked the problem by determining vnad went
into the body by ingestion and inhalation (picocuries per day), and then
applying appropriate factors to such input (exposure) to obtain the dose
in rem. The particular ones I have used are given in Table 4.2 #1.
Ingestion. The major uncertainty lies in the diet--no one
precisely what it is, although several attempts have been made
knows
define
iet,
i.e., ohe involving a greater amount of food and also a greater input of
contaminated food (Note 11). Naidu et al (1980) who originally escribed
it commented that the diet represented prepared, not eaten food and that
it.
To be on the safe side, DOE-1982 chose the BNL community 8B
in fact it was more than a person could eat. This results in
overestimation of dose. The Lawrence Livermore group that used it for
dose calculations concurred.
The 1978 specific activities measured by the Livermore tea
made on 21 samples of coconut, 5 of Pandanus, 1 of breadfruit,
2 pigs and 98 fish, on the whole a barely adequate number (Robi
198la, 1982b). In 1986, however, that Laboratory took addition
{Robison 1988), and in 1987 this reassessment project also coll
which were analyzed independently. The results, summarized in
#2, show remarkable agreement for the Livermore 1978 and 1986 c
on the foods contributing the major part of exposure and also g
agreement for our independent samples in 1987 (Note 8).
were
chicken,
n et al,
samples
ted some
ble 4.2
ium data
ad
I am therefore taking 4400 picocuries/day as the exposure
e to
cesiun-137, based on a total of about 4000 for foods listed in
ble
4.2#2 plus a 10% allowance for a miscellaneous variety of others (Note
ll, Table #1).
The whole-body, red marrow and bone surface dose
years are just about equal, 1.65 rem (Table 4.2 #1).
for 30
—_
The strontium estimates at present are based on the origina 1978
sampling. (No strontium analyses were done on the Livermore 1986 samples,
hor were our 1987 samples delivered soon enough to have them don on
time.) I am therefore taking .035 picocuries/day for the exposu e, based
on the field samples plus a 25% increment for other miscellaneou foods.
The 30-year doses for whole-body, red marrow, and bone surface a fe «=. 032,
-175 and .385 rem, respectively.
In the case of the transuranics, the Livermore group is now
summarizing their Rongelap work through 1987 and this involves s
revision of both data and dose calculations (Table 4.2#3). Base
he
on a