Example 3b - General Solution, Chronic Exposure

DOE-STD -1136-2004

Guide of Good Practices for Occupational Radiological Protection in Uranium Facilities

Example 3b - General Solution, Chronic Exposure

Step 1. Determine specific activity at which chronic exposure results in being exposed to one Derived Air

Concentration (e.g., ALI divided by breathing rate) at the OSHA exposure limit. The ALI for Class D is

used with the OSHA exposure limit for soluble forms of uranium. The ALIs for Classes W and Y are used

for the OSHA exposure limit for insoluble forms of uranium.

Step 2. Use quadratic formula and equation for determining specific activity to calculate enrichment which

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. If both solutions are less than zero, then radiological effects are

always limiting.

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