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»Since I have mentioned maximuin permissibte lung burdens, you
are cware that there is official guidance.
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Twould like to comment on it.
The maximum permissible lung burden is established by equiliurating tic
The International Commission on Rictological
ShodaPWEET ORCS FLATTEELS o" aTaeE Tes ee
uniform dose of x-rays.
Protection indicates this may be greatly in error, and specifically states
- in its publication 9, "In the meantime there is no clear evidence to show
whether, with a given mean absorbed dose, the biological risk associated
- with a noh-homogeneous distribution is greater or less than the risk re-
sulting from a more diffuse distribution of that dose in the lung." (ICRP,
1966).
They are effectively saying that there is no guidance as to the risk
for non-homogenecus exposure in the lung, hence the maximum permissible
lung burden is meaningless for plutonium particles, as are the maximum
permissible air concentrations which derive from it.
So there is a hot particle problem with plutonium in the lung, and
the hot particle problem is not understdcd, and there is no guidance as to
‘the risk.
I don't thinkthere is any controversy about that.
Let me quote
to you from Dr. K. Z Morgan's testimony in January of this year before
.
the
Joint Committee on Atomic Energy, U.S. Congress (Morgan, K.Z.,
1960).
Dr. K.Z. Morgan is one of the United States! two members
to the
main Committee of the International Commission on Radiological Protection; he has been a memberof the commitlec longer than anyone: and he
is director of Healih Physics Division at Quk Ridge National Laboratory.
sem
Uquose:
“There are many things abeut radiation exposure we do not
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