Calculation Check

[azapantis@mgdestmx01.erin.gov.au]

Dear Radsafers

I have recently calculated the dose conversion coefficient for uranium ore dust
to be 3.5E-6 Sv/Bq (total activity) or 7E-6 Sv/alpha disintegration per second. 

My assumptions are as follows;

AMAD = 5E-6m
All isotopes are type S (or type M where ICRP 68 has no type S listing)
Rn-222, Po-218, Pb-214, Bi-214 and Po-214 are absent from the mixture
All isotopes are in secular equilibrium
U-235 chain ignored
Very low probability branches (eg At-218) in U-Series ignored 
Pa-234m contributes to total activity of mixture but not to dose (not in ICRP68) 

Comments on my results, and assumptions will be appreciated.

Regards

Alex Zapantis                                  
Environmental Radiation Officer     
Office of the Supervising Scientist		
40 Blackall Street 														
Barton ACT 2600 AUSTRALIA 
            
Email: azapantis@mgdestmx01.erin.gov.au
Fax : (int+) 61 6 274 1519
Phone: (int+) 61 6 274 1642

The Office of the Supervising Scientist is a Branch of the 
         Federal Environment Protection Group