Re: natural thorium

["James Reese" <james.reese@worldnet.att.net>]

In DOD, we have been using an activity of 0.004 uCi for mantles.

James H. Reese
Health Physicist
(916) 689-2680 tel.
(916) 689-6270 fax
----- Original Message ----- 
From: Craig Reed <CReed@novoste.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Friday, July 09, 1999 8:47 AM
Subject: RE: natural thorium


> Steve,
> 
> Dose estimates for consumer use of gas mantles appear in NCRP No. 95,
> Radiation Exposure of the US Population from Consumer Products and Misc.
> Sources, Section 3.2.8.2 Gas Mantles. The references should contain the
> activity basis for the dose calc's.  From those references, try
> NUREG/CR-1910, An assessment of Radiation Doses from Incandescent Gas
> Mantles that Contain Thorium. 
> 
> Could not find it on the web (could be a user defect!), so you need to
> request one (freebie?) if they got'em:
> 
> Office of the Chief Information Officer
> Reproduction and Distribution
>    Services Section
> U.S. Nuclear Regulatory Commission
> Washington, DC 20555-0001
> E-mail: <DISTRIBUTION@nrc.gov>
> Facsimile: 301-415-2289
> 
>  (I wonder if the report includes a dose estimate to RCT's and educators
> using mantles as check sources? - ha!)  If you need more info, send a
> FOI request to the NRC regarding the license that authorizes
> mfg/distribution of the product or (the direct approach:) call the
> manufacturer.
> 
> Craig Reed
> creed@novoste.com
> 
> -----Original Message-----
> From: Meiners, Steve E. (VSM) [mailto:VSM@BechtelJacobs.org]
> Sent: Friday, July 09, 1999 10:54 AM
> To: Multiple recipients of list
> Subject: natural thorium
> 
> 
> Two questions with respect to "natural" or "source" material.
> 
> Does anyone have a value or reference for the total activity in a gas
> mantle?
> 
> Uranium and thorium in steel and welding rods/wire are exempt from
> regulation by the NRC.  When these radionuclides are concentrated in
> slag do
> they become a regulated waste?  What about DOT issues?
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