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Re: Lung cancer mortality from radon versus mortality from other cancers

John, Radsafers,
 
ERR/WLM means Excess Relative Risk per Working Level Month (WLM).  One WLM is the exposure accumulated during 170 hours (''standard'' work month) in an atmosphere with a concentration of potential alpha energy from short-lived Rn-222 decay products (Po-218, Pb-214, Bi-214, Po-214) of 130 000 Mev per liter. It is also equivalent  to any combination of exposure time and concentration that results in the inhalation of the same quantity of potential alpha energy.
 
One WLM is equivalent to 4.25 millijoule of inhaled alpha energy. 
 
 
Philippe Duport
International Centre for Low Dose Radiation Research
University of Ottawa
555 King Edward Ave.
Ottawa, ON, Canada, K1N 6N5
Tel: (613) 562 5800, ext. 1270
pduport@uottawa.ca
----- Original Message -----
Sent: Friday, January 18, 2002 5:50 PM
Subject: Re: Lung cancer mortality from radon versus mortality from other cancers

In a message dated 1/18/2002 11:35:16 AM Eastern Standard Time, pduport@uottawa.ca writes:


Cohort : Chinese tin miners
Number of measurements (Rn or Rn decay products) : 26500
Number of workers in the cohort : 13649
Number of measurements per worker : 1.94
Number of person.y : 17607
Average number of years of exposure : 1.3
Number of lung cancer cases : 936
ERR/WLM : 0.16   (0.1-0.2)


Could you please explain the correct meaning of ERR/WLM.  In gereral I hate to deal with acronyms and I want to understand what is being said.

Thanks.

Perhaps all RADSAFE should get the answer.



John Andrews
Knoxville, Tennessee