[ RadSafe ] Thorium in gas lamps

[JSBland at aol.com]

NUREG-1717 used 250 mg, or approximately 27 nCi or 1000 Bq.  This  value is 
based on a study by Luetzelschwab and Googins, HP Journal Vol. 46, No.  4 
(1994).  Hope this helps.
 
Stewart Bland