Bob,
Industrial facilities are regulated by OSHA (if they are not regulated by NRC).
OSHA Interpretation says any building that concentrates Rn above background, artificially enhances the radiation exposure so is subject to OSHA regulation, even if the employer doesn't possess, use, etc. the Radon.
29 CFR 1910.1096 is the cite.
Max exposure is 1.25 R/Quarter
MPC (yup, NRC from 10 years ago) is 3E-8 µCi/ml (30 pCi/l) (NOTE: you need to get ahold of an old 10 CFR 20 Appendix B to find the MPCs. They are not all the same as the ALI/DAC tables in the new App. B. Rn is however)
Must post areas at 25% of MPC (7.5 pCi/l) (this is for a 40 hour work area and can be averaged for greater or lesser work times) also must post all areas over MPC. (30 pCi/l)
Problem areas:
If you work 75 hours a week or more in an area, it needs to be posted at 4 pCi/l
24/7 workers would need posting at 1.8 pCi/l
Minors (under 18) have an MPC of 3 pCi/l
We submitted a request for interpretation 4 or 5 months ago asking to put a lower limit for posting at 4 pCi/l. No word back yet
Luke McCormick
Health Physicist, HTRW-CX
Luke.I.McCormick@usace.army.mil
-----Original Message-----
From: The Wilsons [mailto:robhwil@bigfoot.com]
Sent: Monday, April 23, 2001 11:03 PM
To: Radsafe
Subject: Shipping Containers and Radon
Unfortunately I deleted the message before I got the information but
thought I would pass this along to Ted in any case. A good source of
plastic boxes for shipping that will meet DOT specifications is:
http://www.hardigg.com/hardigg_cases/single_lid_cases.htm
I hope this helps.
Does anyone know what limits (if any) are established for Radon and its
daughter concentrations in industrial facilities is?
Bob
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