Modeling the dose to man from exposure to tritiated water vapor Page: 4 of 11
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explicitly covers the above scenario. Previous tritium dose models have
used the deposition velocity-dose conversion constant method applied to
surface concentration and deposition measurements or calculations. Although
applicable to most radionuclides, this method was shown to be grossly over-con-
servative for the U.S. gas stimulation experiment at Rulison, Colorado.
Recently we have made significant progress in realistically modeling dose-to-
man from release of HTO to the atmosphere. The purpose of this paper is to
describe our improved model.
A. Dry Deposition or Very Light Rain
Anspaugh et al. , App' I] have developed a dry deposition dose-to man model
for inhalation-submersion and various food-chain pathways. This model was
based upon experimental studies at the LLL Bio Medical Division and elsewhere
on the ecological transport of HTO, and was developed in conjunction with
Project Rulison, the second U.S. gas stimulation experiment.
For food pathways the model assumes tlut during cloud passage the
concentration of tritium in vegetation moisture, Cv, where v denotes
vegetation, is proportional to the average surface air concentration of
tritium, 't, divided by the absolute humidity of the surface air, H. A
proportionality constant of 0.5 was derived on the basis of experimental
Cv = 0.5
After cloud passage or exposure of time T, the tritium concentration in
vegetation water is
Cv = C" e~p
t' = t-T
t = time since exposure started, day
elimination rate of tritium from forage, dafy1.
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Anspaugh, L. R.; Peterson, K. R. & Robison, W. L. Modeling the dose to man from exposure to tritiated water vapor, article, December 1, 1974; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1017373/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.