Working Level Month (WLM)
A unit of measure used to determine cumulative exposure to radon.
Source: Terms of the Environment ...
Working Level (WL)
A unit of measure for documenting exposure to radon decay products, the so-called "daughters." One working level is equal to approximately 200 Pico Curies per litre.
Working Level Month (WLM) ...
Cumulative Working Level Months (CWLM)- The sum of lifetime exposure to radon working levels expressed in total working level months.
Personal Fall Arrest System: A system including but not limited to an anchorage, connectors and a body belt or body harness used to arrest an employee in a fall from a working level.
 See also: Exposure, Radon, Table, Contaminant, Water
  
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