Re: Chemistry Question

[stallsmi@smtp-gw.gdls.com (Dennis G Stallsmith)]

     Tad:
     
     Some of the optical components in our systems are also coated with 
     thorium fluoride.  To find the radiothorium content of a specific 
     component:
     
     
     ThF4 mass/area = (ThF4 coating thickness) X (ThF4 density)
     
     Th232 mass/area = (mass/area of ThF4) X (232/308)
     
     Th232 mass = (Th232 mass/area) X (area of coating)
     
     Th232 Activity = (Th232 mass) X (Th232 specific activity)
     
     
     Hope this is of some help to you.
     
     
     Dennis G. Stallsmith
     Div. Radiation Safety Officer
     Engineering Specialist
     General Dynamics Land Systems
     38500 Mound Road
     Sterling Heights, Michigan 48310
     stallsmi@gdls.com
     (810) 825-5767
     
     
     
______________________________ Reply Separator _________________________________
Subject: Chemistry Question
Author:  radsafe@romulus.ehs.uiuc.edu at Internet/Unix 
Date:    6/23/99 7:42 AM
     
     
Hello All,
     
     
If a glass lens is coated with 1000 Angstroms of Thorium-Fluoride, how do we 
determine the total activity (picocuries?) of the Thorium in the coating?
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