RE: Radon Levels

["Reynolds, Harold" <Harold.Reynolds@rfets.gov>]

> -----Original Message-----
> From:	Otto G. Raabe [SMTP:ograabe@ucdavis.edu]
> Sent:	Thursday, June 15, 2000 11:12 PM
> To:	Multiple recipients of list
> Subject:	Re: Radon Levels
> 
> I have seen the working month defined anywhere between 167 and 175 hours
> depending on whether or not vacation, holidays, and overtime are taken
> into consideration. 
> 
> The derivation I remember for the 4 pCi/L is as follows:
> 
> (40 hrs/week)(52 weeks/yr)/(12 months/yr)=173 hrs/month=1 working month
> 
> (.02 WL)(24 hrs/day)(365 days/yr)=175 WL-hrs= 1 WLM
> 
> Note that this is based on continuous occupancy (shut-in) conditions.
> 
> 4 pCi/L will yield .02 WL at 50% equilibrium.  This is the really "iffy"
> assumption.  In my many measurements, the equlilibrium was rarely 50% and
> ranged from 20% to as high as 70%.  At 40% equilibrium (a condition more
> common for forced air systems) 4 pCI/L will result in .016 WL.  This is
> why I always measured and reported in WL rather than gas level.  At 4
> pCi/L the homeowner would panic, at 0.016 WL (<0.02) they were happy.
> 
> Harry
> Harold.Reynolds@RFETS.gov
> 
> 
> 
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