MadSci Network: Physics
Query:

Re: Has anyone ever measured the positron apparent range in matter?

Date: Wed May 24 08:56:43 2000
Posted By: Samuel Silverstein, faculty, physics, Stockholm University
Area of science: Physics
ID: 958392486.Ph
Message:

I took your question to a colleague in the nuclear physics department. The kind of data that you are looking for has been published in a report for the International Commission on Radiation Units and Measurements (ICRU). The report (ICRU report 37) is entitled 'Stopping Powers for Electrons and Positrons', and can be ordered from the ICRU. Here is a link to the ICRU report descriptions, and here is the order form page.

The variable you are looking for is the CSDA range (continuous slowing down approximation), measured in g/cm^2, which is an estimate of the total path length that the positron takes through the material. It is a pretty good estimate as long as the positron energy is not too small.

I hope this helps. Please contact MadSci again if you have further questions, and ask for me as the answerer.


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