Working Level Month (WLM) 2
Working Level Month (WLM) 2 :
The exposure to radon progeny or thoron progeny which would be incurred during a working month (170 hours) in a constant potential alpha energy concentration of one working level. The term working level month is now obsolete and its use is discouraged. In SI units, a working level month is 3.54 x 10-3 J.h/m3 (approximately)
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