Management of Commercially Generated Radioactive Waste - U.S. ...

C.2
the year of intake, and charge this total dose to that year for comparison with the dose
standard. Alternatively, the total radionuclide intake for the year is compared to the
annual intake used in calculating the Concentration Guide, and the resulting ratio is used.
The latter is in keeping with the latest ICRP guidance (1977). In all cases the internal
dose should be added to any dose from external sources.
According to Taylor (1973), the basic recommendation of both the NCRP and ICRP was that
individuals in an exposed population (without the medical supervision given the worker and
with no direct benefit from such incidental exposure) should not receive in excess of 1/10
the maximum permissible dose of radiation workers. As an allowance for the variability of
exposure and the variable susceptibility to radiation effects of the general population
(which includes different age groups, genetic backgrounds, and both sexes), the Radiation
Protection Guides (RPG) (dose limits) of the FRC (1960) were further reduced by a factor of
three for the average of general population groups. The resulting RPG of 0.17 rem per year
average whole body dose for population groups coincided with the later ICRP recommendations
(1964) for limiting average gonad dose of the population, based on the possibility of gene-
tic effects, to 5 rem in 30 years, excluding medical exposures.
From these studies, the present guidlines have been derived. The "as low as reasonably
achievable" guide, and the limits derived from 10 CFR 20 and other analyses, are identified
below.