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in land areas for residential use, specifying that
238
Pu levels shall not exceed 2 dpm (0.91 pCi) per
ram of surface soil]
l cm depth of soil).
(i.e.,
averaged over the top
It is noteworthy that the
AEC has not established that this standard is unduly
consecvative and it is not apparent that the AEC
has requested the ICRP or NCPP to make specific
recommendations with respect to standards for Pu in
Soils applicable to°chronic exposure to the general
public, including children.
I note that the DEIS recommends no remedial
‘action for soils containing « 40 pCi or
« 88 dom
Pu/g, averaged over the top 15 cm depth.
This is
much more than 44 times the Colorado interim standard
(2 dpm per g in the top 1 cm) because for most
Enewetak soils the top cm contains substantially
higher levels of Pu per gram than the 15 cm depth
average.
Thus, for example, at location 101 on
Pearl, the top 1 cm depth shows 400 pCi 239u/s,
whereas the average over 15 cm depth is about 60.
Thus the recommended standard for Enewetak is about
100 to several hundred times that adopted in Colorado.
There are recent research developments which
are expected to lead to reductions in acceptable
Organ burdens of Pu in man by a factor of 100 to
1000 or more.
In my opinion it is likely that a 10