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DOE-STD -1136-2004
Guide of Good Practices for Occupational Radiological Protection in Uranium Facilities
Table 2 -13. Impact of Requirement To Monitor at 2%
Enrichments above which radiological concerns predominate
Acute
Chronic
Transportability
Using 100% of
Using 2% of
Using 100% of
Using 2% of
Class
Radiological Limit
Radiological Limit
Radiological Limit
Radiological Limit
D
(1)
7.38%
18%
(2)
W
52.8%
0.52%
12.8%
(2)
Y
0.82%
(2)
(2)
(2)
(1) Chemical toxicity concerns are limiting at all enrichments.
(2) Radiological effects are limiting at all enrichments.
Example 3a - General Solution, Acute Exposure
Step 1. Determine the intake that results in a kidney burden of 0.337 mg:
Step 2. Use the quadratic formula and equation for determining specific activity to calculate the enrichment
that corresponds to the specific activity obtained in Step 1.
Step 3. One solution will be less than zero. The other will be the enrichment that is the "dividing line"
between chemical and radiological effects.
2-29


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