average and maximum doses.
The Federal Radiation
Council suggests the use of the arbitrary .assumotion
that the majority of individuals Co not vary from the
average by a factor greater than three.
Thus, we
recommend the use of 0.17 rem for yearly whole-body
exposure of average population groups.
(It is noted
that this guide is also in essential agreement with
current recommendations of the NCRP and the ICRP.)
It is critical that this guide be applied with reason
and judcment.
Especially, it is noted that the use
of the average figure, as a substitute for evidence
concerning the dose to individuals, is permissible
only when there is
a probability of appreciable homo-
geneity concerning the distribution of the dose within
the population included in the average. /
ot A ee wr
Strict adherence to these guidelines implies that
the ambient air standard should be zero particles. 89
While a variety of suggestions could be proposed, we recommend
a slight deviation from these guidelines and the acceptance
ee
ee ee
of the disproportionate risk implicit in the 0.2 particle
standard.
This is a workable solution since best estimatcs
of lung burdens can be fractional quantities.
Thus, we
recommend that the MPLPB for members of the public be 0.2
hot particles, and the average lung burden for members of the
public be 0.07 hot particles, a factor of 3 less than the
maximum.
79/ FRC Report No. 1, Op. cit., p. 27.
80/
Had we based the standard on a 1/10,000 risk per
particle
(See Table V),
the MPLPB would have been one
particle and this problem would not exist.