-4year 1966 for thirty non-urban locations in the United States,
No similar
data are available for Enewetak or an equivalent south sea atoll location,
The average mean value for the 30 locations in Table II is 38 micrograms
per cubic meter (microgram/m”),
Assuming, to be conservative, that
the average airborne particuluie concentration level at Enewetak is 150
microgram /m’, and further assuming that all of this particulate matter
consists of local soil (i,e., no salt spray from the ocean), one obtains a
value of 400 pCi/gm as an average surface soil concentration which corresponds to the ICRP guide for maximum permissible average airborne concentration of plutonium,
In the evaluation of the radiological condition of Enewetak, we will apply
the criteria that areas in which any soil samples show concentrations
greater than 400 pCi/gm should receive corrective action,’ areas which
showsoil concentrations between 40 and 400 pCi/gm may receive corrective
.
‘action, depending on other radiological conditions present, and areas showing
1
less than 40 pCi/gm
do not require corrective action because of the presence
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