othervise, the guide for a suitabie sample (one-third the guide for the
individual) is to be used.
This operational technique may be modified
to meet special situations.
The FRC primary numerical guides, expressed in rem, are provided in two
reports, FRC Nos. 1 and 2, surmarized in Table I.
guides developed by FRC are expressed in
Secondary numerical
terms of daily intake of specific
radionuclides corresponding to the annual 27G's.
Consideration is given
to all radionuclides througn all patiways to derive a total annual exposure
for comparison with FRC guides.
However, for many practical situations a
relatively few radionuclides yield the major contribution to total
exposure; by comparison, exposures from others are very small.
TABLE
I
v/
FRC RADIATION PROVEC'TVION GUlDEsS—
Whole body
Gonads
Individual
Population Group.
0.5 rem/yr
0.17 rem/yr
-
5 rems/30 yrs
Thyroid 2/
1.5 rems/yr
0.5 rem/yr
Bone marrow
0.5 rem/yr
0.17 rem/yr
Bone
1.5 rems/yr
0.5 rem/yr
Bone (alternate 2/
guide)
0.003 pg of
2262, in adult
0.001 ye of 7#°Ra
in adult skeleton
skeleton
1/
2/
For conditions and qualifications see FRC Report Nos. 1 and 2.
Based upona childs thyroid, 2 gms in weight and otherfactors
listed in paragraphs 2.10-2.14 of FRC Report No. 2.
3/
Or the biological equivalents of these amounts of 226p.,
449-03