FW: GM Detector Response to Positrons

[glen.vickers@EXELONCORP.COM]

> What do you suppose the GM pancake probe response would be to a positron

> emmitter like Co-58?  I would think that if the positron made it into the

> sensitive volume of the detector, that it would cause some form of

> ionization that would be counted.  

> 

> Would the positron ever make it out of the phyical-form crud it is

> deposited in?  Once generated, there are "clouds" of electrons nearby for

> the positron to interact with.

> 

> The positron will have kinetic energy imparted from being accelerated from

> the positive charges in the nucleus, but then again the cathode in the GM

> tube will try to prevent the positron from entering the GM tube.

> 

> I've never seen anything in a text book about detection.  Any references?

> 

> Power reactors make a significant amount of Co-58 and it's important to be

> more knowledgeable in this area...

> 

> Glen Vickers

> Braidwood Nuclear Station





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