report;
the maximum permissible lung burden
maximum permissible concentration in air
(MPLB)
(MPC,).
and the
The MPLB
is the total amount of a given radionuclide in the lung of
an average size man that will result in the lung being
irradiated at the maximum permissible
lung dose
(MPLD).
The MPC, is the concentration in air that will result in
an average
adult male obtaining. a MPLB and hence a MPLD by
breathing the air.
It is important to recognize that the MPLD is the
primary standard; it applies to all radionuclides and
radiation sources.
The MPLB and the MPCa are derived standards
and are specific for a radionuclide.
are related
These derived standards
to the biological properties of a radionuclide
and to the form of raciation it emits.
Table I lists the existing exposure standards for employees of the nuclear industry that apply to Pu-239 in insoluble
form.
The MPLD of 15 rem/yr is included in the recommendations
of the Internaticnal Commission on Réciological Protection
(rerp) ® the National Council on Radiation Protection and
Measurements
8/
(NCRP)?,
and
ICRP Publication 9,
the Federal
Recommendations of the International
Commission on Radiological Protection
Pergamon Press,
Radiation Council
New York,
1966,
p.
14.
(Adopted September 17,
9/ NCRP Report No. 39, Basic Radiation Protection Criteria,
NCRP Publications, Washington, D. C.; Jan. 15, 1971, p. 106.
1966),