Calculating Worker Exposure to Radon & Radon Decay Products
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The exposure of radon workers to radon and RDP’s can be calculated with the units of measurement for radon (pCi/L), RDP’s (WL), and equilibrium ratio (ER). Occupational exposure to RDP’s is measured in Working Level Months (WLM).
The following is considered when calculating WLM:
- One WLM is the equivalent of exposure to 1 WL for 170 hours.
- RDP measurement levels (in WL’s) are multiplied by the duration of exposure (in hours) divided by 170 to obtain exposure levels in WLM’s.
Example of WLM exposure record:
Exposure calculation in WLM:
