-
To these comments,
the
comments
"
.
of
.
Dr.
A.
21-
referenced by Geesaman,
B.
can be added
Long:
there is an urgent need to dispell the sense of
security and certainty that the present limits for
the maximum permisslvle lung burden and
permissible air ccncentration bring . .
the maxviman
. the public
should be informed of the uncertainties that exist.
in these
Vi.
limits."
Biological Data Related to Cancer Risk from Insoluole
Plutonium Particles
We have shown that insoluble alpha-emitting particles
result in intense but localized radiation.
They can irradiate
We said that the available biological data strongly suggest
i"
at very high doses without being organism- or organ fatal.
that a DF=1 grossly underestimates the DE for insoluble
particulates of Pu-239,
and consequently,
the derived standards
MPLB and MPC. for this radionuclide are greatly in error.
We now turn to the experiments involving cancer induction
é
.
by intense local exposure,
,
since these
F
‘
are especially
relevant in judging whether or not insoluble alpha-emitting
particles constitute a unique risk.
Geesaman collected
and analyzed the pertinent experiments, and what follows
32/
Long, A.B-,
Op. cit., p. 73.
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