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A guide for assessing the importance of a certain soil level of Pu on
Enewetak can be arrived at by a set of conservative assumptions regarding the resuspension pathway,
This is the "'critical'' pathway since the
inhalation route to man is more hazardous than the soil-root pathway
for ingestion of plants by man.
These assumptions are:
ae
1,
Leon, Vat © tet
Plutonium in soil is resuspended at rates similar to the soil
ed
;
s
ewAd ¢ Laat
material, e,¢,, the specific activity of soil equals the specific
activity of air particulates,
2,
All particles in air originate from local soil,
3.
Plutonium in air is all in the respirable range of particle size
and is soluble in lung fluids,
Appendix II develops average lifetime exposure to
particulates in air by
Prtnnnt
the returning population, combining thé‘ireumenic outlined above with an
analysis of air concentrations and time-of-exposure weightings to be
expected for the mix of environmental conditions associated with routine
activities (ambient) and under special conditions which stir up the soil,
In Table II are reproduced airborne particulate concentration data published by the U. S, Dept, of Health, Education, and Welfare* for the
oe
*Air Quality Data; 1966 Edition, APTD 68-9
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