~
50
-
the value selected by Kathren be used when the RF is unknown
to determine the ambient ground contamination standard.
Applying an Rr=ic74 m71 to the ambient MPCa standard
recommended in the previous section, we obtain a maximum pere
missible surface contamination
of 9x1078 uci/m.
86
(MPSC)
;
This is roughly 1 hot particle/m.
In areas where an RF greater or less
be shown to apply,
E,
level for hot particles
than 1074 m1 could
the MPSC could be altered appropriately.
As Low as Practicable Hearinas
It is to be understood that the above recommendations
do not represent Sndorsement on our part of the risk
inherent in the existing radiation protection guidelines
upon -which these recommendations are based,
Rather, we offer
the admonition that the exposures should be kept as far
below these guidelines as is practicable.
Therefore, we
further recommend that these guidelines be incorporated
into the existing regulations without’ delay and that the
appropriate agency or agencies convene hearings to determine
for the regulations what constitutes as low as practicable
limits for exposure to hot particles.
86/
This value is derived as follows:
for hot particles
is
9xl07 18
The recommended MPCa
uci/ml which
corresponds
to
9xl0712 uci/m3. The maximum ground contamination level, using
RF=1074 m-1, is 9x10712/10-4 = 9x10-8 uCi/m2.
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