NV/HEG Mtg.-Sept. 26-27, 1968
Page 3
picocuries of 1-131 per kilogram of forage and from this level to more
accurately estimate the peak level of radioiodine in milk which will
occur at that
T-131,
location at some later time.
Milk is then measured for
the peak of which should occur between two and four days after
the test, providing a final confirmation of any potential problem.
The substitution of uncontaminated hay for contaminated green forage
can reduce the potential radioiodine in milk and ultimately the resultant
dose to humans,
depending upon the time intervening between the test
and the substitution.
For example,
the substitution of uncontaminated
hay on D+3 days can reduce the potential dose about 70 percent compared
to total dose when no countermeasures are employed.
Prediction before the test event has been primarily the function of
ESSA.
The source information is provided by the Laboratory conducting
the test.
Then, based upon certain meteorological assumptions
the wind speeds,
diffusion,
dispersion,
(shear,
etc.) ESSA predicts a depo-
sitionvalue in picocuries per square meter.
Using the information collected from various tests and experiments the
PHS has constructed various graphs and tables by which rough estimates
a:
om
of the radioiodine level to be expected in milk can be made following
a test.
Various conditions of green forage densities,
and hay ingestion have been covered.
pasture types,
Peak gamma exposure gate readings
at the time of cloud passage are corrected to H+6 hours and have been
correlated to peak I-131 milk concentrations.
Soiatateietinn
SNL