~
TABLE Il
Existing Exposure Guidelines for Non-Occupational Exposure
that Apply to Pu-239 in Insoluble Form*
Individual
Population Averade
MPLD
1.5 (0.5) rem/yr
0.5 (0.17) rem/yr
MPLB
0.0016 (0.0005) uCi
0.0005 (0.00017) uci
MPC,
10722 (3x10713) uci/ml
3x10723 (10723) uciymi
(ICRP, NCRP, FRC)
**
(ICRP, AEC)
“* he MPLD values in parentheses refer to the latest
. recommendations of the NCRP.
The MPLB and MPCga values in
“~parentheses correspond to the new NCRP dose recommendations.
IV.
Calculating the Dose Due to Insoluble Alpha-Emitters
The purpose of this section is to examine the assumptions
in the radiation standards above that are inappropriate when
-
_~_—_
applied to insoluble alpha-emitting particulates such as
-
‘aerosols of Pu09.
The assumptions are introduced through a
—
review of basic definitions of radiation dose and the factors
used to calculate the dose,
A,
The Dose Eculivalent
When an X-ray or the radiation emitted by a radionuclide
“passes through tissue it transfers energy to the cells in