[ RadSafe ] Re: Q-ray blanket containing radium

[J. Marshall Reber]

On Feb 12, 2007, at 9:05 AM, NeilKeeney at aol.com wrote:
> But, a  'casual' pass with an RO-2 open window at
> about 1 cm resulted in a read of  just over 20 mR/hr or, applying a
> conventional correction factor, about 80 mRad

Could you elaborate on the assumptions inherent in this statement?   
Given an ion chamber calibrated to indicate mR/hr when detecting only  
gammas with the (beta) window closed, what is the "conventional  
correction factor" that converts a reading with the window open to an  
energy absorbed dose in mRad?