RE: Occupational Exposure Limits for Radon Exposure

["Fleming, Kenneth" <knflemin@bechtel.com>]

I'm currently away from my reference material, but the old 10CFR835 required
that exposures to radon and/or daughters above a dose equivalent of 100
mrem/year had to be accounted and documented.  We requested and received an
exemption (really an extension) of the 100 mrem/year exposure to radon/radon
daughters to 500 mrem/year through the DOE.  We went through the process of
assessing exposure over a long term with an active radon daughter measuring
device (Canadian make, AlphaNuclear).  This data allowed us to document that
occupational sampling would not be necessary.

Check with Riasp Madora at Fernald.  They were set up to conduct long term
(~1 month) air sampling for radon daughters, but I'm not sure whether they
have ever had to sample occupationally.

Kenny Fleming
knflemin@bechtel.com
(423) 220-2306

> -----Original Message-----
> From:	FIELDRW@aol.com [SMTP:FIELDRW@aol.com]
> Sent:	Wednesday, November 11, 1998 11:41 AM
> To:	Multiple recipients of list
> Subject:	Occupational Exposure Limits for Radon Exposure
> 
> Radsafers,
> 
> Are you aware of any existing Federal or State regulations limiting
> occupational radon exposure.
> 
> The MSHA (30 CFR 57.5039) states " ...persons should not be exposed to air
> containing concentrations of radon daughters exceeding 1.0 WL (100 pCi/L
> or
> 3700 Bq/m3) in active work areas."
> 
> Is this still the current accepted standard or are there others?  I also
> understand OSHA has a 4 WLM standard.  Any insights would be appreciated.
> Please email me directly at:  mailto:bill-field@uiowa.edu
> 
> Thanks for your help --
> 
> Bill Field
> bill-field@uiowa.edu
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