Positronium range?

["Stabin, Michael" <michael.g.stabin@vanderbilt.edu>]

OK, I heard something new (for me) at a workshop in Europe this week -

that the positronium has a defined range in matter after formation. We

always focus on the range of the positron in discussing resolution

limits in Positron Emission Tomography, and I always had the idea that

the formation of the positronium 'atom' occurred at the end of the track

and that was where the two 511 keV photons were formed. But someone

modeling the physics with Monte Carlo methods was including a fixed

range for the positronium formed as well, which of course will

contribute to this resolution issue. Have others heard of this?



Mike



Michael G. Stabin, PhD, CHP

Assistant Professor of Radiology and Radiological Sciences 

Department of Radiology and Radiological Sciences 

Vanderbilt University 

1161 21st Avenue South

Nashville, TN 37232-2675 

Phone (615) 343-0068

Fax   (615) 322-3764

Pager (615) 835-5153

e-mail     michael.g.stabin@vanderbilt.edu 

internet   www.doseinfo-radar.com



 

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