[ RadSafe ] SCBA and beta dose connection?

[Ferguson, Dennis]

John, et. al.,

While I never met Mr. Dubiel at TMI (arrived there too late), he brings up a very good point. We had "Red Tag Key" (High Beta) areas in Unit 2 where we occasionally used DOUBLE respirator lenses (one clipped with springs on the outside of the respirator). Strontium/yttrium betas tended to blast through a lot of PCs (we also wore Fireman's Boots, Bunker Pants, Bunker Coats, Lineman's Gloves and double herculite hoods over our PCs in those areas... a wee bit warm! Talk about heat stress...) 

We had a table similar to what Mr. Perle describes set up for Sr/Y fields we used when writing out RWPS. We had a table of the various PC materials (mg/cm2) and could figure an attenuation factor on a graph. I have a copy somewhere amongst my piles of documents. If you're working around fission products or the like, it might be good to consider generating one for your techs.

Dennis E. Ferguson | Program Supervisor 
Dept of Environmental Protection - Radiation Protection
Southcentral Regional Office 
909 Elmerton Avenue, Harrisburg, PA  17110-8200 
Phone: 717.705.4891   |   Fax: 717.705.4890 | denferguso at pa.gov
www.dep.state.pa.us/brp



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Perle, Sandy
Sent: Thursday, April 12, 2012 5:37 PM
To: The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] SCBA and beta dose connection?

When at FPL back in the late 80's we did a study for beta attenuation. If I recall, ~70 mg/cm^3 attenuated about 95% of the beta dose posture. I have the study somewhere in my files.

Sent from my iPad

On Apr 12, 2012, at 3:03 PM, "radbloom at comcast.net" <radbloom at comcast.net> wrote:

> 
> 
> John,
> 
> 
> 
> While I'm not sure it's always true, many SCBA models includes a full-face shield, which would significantly reduce or eliminate (depending on beta energy and shield thickness) beta dose to the eyes/face. 
> 
> 
> Cindy Bloom
> 
> 
> ----- Original Message -----
> 
> 
> 
> 
> From: "Randy Redmond (RXQ)" <redmondrr at y12.doe.gov>
> To: radsafe at health.phys.iit.edu
> Sent: Thursday, April 12, 2012 3:29:52 PM
> Subject: Re: [ RadSafe ] SCBA and beta dose connection? 
> 
> Beta dose rate to the eyes? 
> 
> Randy Redmond
> B&W Y-12
> Radiological Engineering
> 865.574.5640
> 
> -----Original Message-----
> From: radsafe-bounces at health.phys.iit.edu 
> [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of 
> JOHN.RICH at sargentlundy.com
> Sent: Thursday, April 12, 2012 3:12 PM
> To: radsafe at health.phys.iit.edu
> Subject: [ RadSafe ] SCBA and beta dose connection? 
> 
> I have a document in front of me that states, " IF SCBAs are used, the 
> beta dose rates may be neglected."  The context is in a post -accident 
> mission dose determination where the effect of SCBAs is discussed. 
> I'll admit my ignorance on this one.  Does anybody know where this 
> came from or what would support it?
> 
> thx in advance  - -jmr
> 
> John Rich
> 312-269-3768
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