RE: natural thorium

[Craig Reed <CReed@novoste.com>]

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?
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html