(955 woke. dor bis” fom Se 2
2, Of x Ele?
= 87
AW
DKS
ot~ wridnes x ko”“£0.073.
——
‘
-53-
—
Py
See
HW-80991
content of milk sold in local stores during4963.
The reéult is about 0.0lyc
50°?
for the year which would be about 15% of the. FRC guide for a population —» a9?te
exposed to gr2? from a normal peacetime source.
Figure 22 shows the rela-
tionship to the intake guide based on exposureto the bone.
The contribution from nuclides of Hanford origin in drinking water
is substantially different for the three cities as discussed in Section II-B.
The dose to the GI tract was greater in Richland than in the cities further
downriver because of a greater abundance of the short-lived nuclides.
As
shown in Figure 21, (and previously in Table VII) the exposure accrued during the last 4 months of 1963 is estimated at about 25 mrems—about 5%of the
population limit.
The value is expected to be proportionately higher in 1964
when exposure extends over a full 12 month period.
The contribution to the
GI dose from other sources was relatively insignificant.
concentration of bone seekers, such as Sr
90
32
Conversely, the
and P’”, in the water was so
low that drinking water did not significantly contribute to the bone dose.
The most appropriate ''exposed population" to consider in relation
to ysl intake and dose to the thyroid would appear to be small children of
Pasco who drank water from the municipal system throughout the year
(0.4 liters per day) as well as milk from the local stores (1 liter per day).
Further, these same children were assumed to eat daily about 25 g of fresh
vegetables obtained from local markets.
The contributions of isl from
these principal sources are shown in Figure 23.
The total intake of pst for
the year is estimated at about 2000 pc or an average of abou
per day.
This is in the middle of the FRC Range F-the most favorable range.
Figure 24 shows the estimated total body exposure from artificial
radionuclides of about
15 mrems for the average Richland resident for 1963.
Virtually all of this contribution is assigned to sr?from fallout and the
method of calculation yields a value that is unrealistically high as mentioned
in the case of the ''Maximum Individual''.
The total dose does, however, in-
clude a small contribution (about 1 mrem) from nuclides of Hanford origin
(principally Na“4, and zn®) ingested with drinking water and (zn®° only)