20
5. CONCLUSIONS
A method is described whereby the concentration of any
radionuclide deposited on the ground can be derived from the exposure
rates shown in the fallout pattern; fractionation is included
specifically.
Field data are consistent with calculations.
The
radionuclide composition of fallout within 160miles of ground zero can
be adequately described as having all the volatile nuclides and half of
the refractory nuclides present in unfractionated debris.
The
calculated surface concentrations (uCi/m?) of volatile nuclides are
as accurate as the meter readings, which are accurate to +20%.
The
calculated surface concentrations of refractory nuclides are accurate
to +30%..
Acknowledgements--The author wishes to extend his sincere thanks to Dr.
Norman A. Bonner, who verified the algorithms, helped restructure the
calculations, and provided many fruitful discussions during the course
of the work; to Mr. Walter H. Martin who wrote the computer program;
and to Dr. Lynn R. Anspaugh for his help in finding the necessary data
and providing direction and encouragement.
This work was performed
under the auspices of the U.S. Department of Energy by Lawrence
Livermore National Laboratory under contract No. W-7405-Eng-48,