Re: shielding of a accelerator facility

[james.m@atomcon.gc.ca]

    There *might* be a problem with photoneutrons - I'm aware of one facility 
    which had the other order of shielding - lead outside the concrete - 
    resulting in a small but undesirable neutron field outside the shielding. 
    
    In your case, the concrete might well be able to shield the outside from 
    neutrons, but there could be a higher neutron field inside the bunker, 
    leading to problems with the maze design.
    
    Mike James


______________________________ Reply Separator _________________________________
Subject: shielding of a accelerator facility 
Author:  <radsafe@romulus.ehs.uiuc.edu> at INTERNET
Date:    2000-04-07 04:12


Hello,
    
Does anybody know of any problem in having a 18MV accelerator for 
radiotherapy treatments in a bunker (shielded room) whose walls are
made of lead + concrete?. That is, neutrons get first to the lead shield 
and then to the concrete, and not the other way round, which is most 
common among shielded bunker doors (in fact neutrons and fotons get 
first to a paraffin layer and then to the lead).
    
Thanks in advance.
    
Carmen Conte
cconte@correu.gencat.es
************************************************************************ 
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