-35results were obtained.
HW-380991
By assuming a 4 gram thyroid for a 4 year old child
and consumption of 1 liter of milk per day produced at the farm, it was
estimated that the maximum thyroid dose during the 3 month period following
the incident did not exceed 30 mrems,
A whole body counter measurement
of us child's thyroid in October 1963 confirmed the estimated thyroid burden
of I
.
The value of 30 mrems can be compared with the FRC Radiation
Protection Guide for individuals of 1500 mrems per year.
Columbia River water removed below the reactors for irrigation is a
source of F 32 and zn® in milk at dairy farms in the Riverview and Ringold
65
areas (Figures 14 and 15).
The average concentrations of Zn
in milk from
the Riverview-Ringold area during 1963 was about 600 pc/1, and the concentration of F
32 was about 800 pc/1. zn°”
or F
32
are usually not detected in
milk that is distributed through commercial outlets in the Tri-City area
because such milk is not usually obtained from areas irrigated with water
obtained from the Columbia River below the reactors.
At a consumption rate of 1 liter of milk per day the ''fallout" radionuclides would contribute an average annual dose of less than 1 mrem to the
GI tract, about 8 mrems to the total body, and about 7% of the FRC rate of
intake guide for bone. * Those residents who drink milk obtained locally from
the Ringold and Riverview areas would receive some additional exposure from
p32
amounting to about 8 mrems to the GI tract,
total body, and about 2% of the MFRI for bone.
3 mrems to the
Data concerning concentra-
tions of radionuclides in milk are continued in Appendix C, Table 1.
Analyses of miscellaneous fresh produce purchased during the 1963
growing season from local farms and markets substantiated prior experience
that only small quantities of radionuclides are present in locally grown produce under normal plant operating conditions.
Results of measurements on
farm produce are tabulated in Appendix C, Tables 3, 4, and 5.
*
The Federal Radiation Council does not consider fallout from the testing of
weapons to be from ‘normal peacetime operations" and thus subject to
Radiation Protection Guides applicable to industry.