Re: [Phys-l] Gamma-Gamma Coincidence

[Bernard Cleyet <bernardcleyet@redshift.com>]

The K absorption edge of both Th and U is greater than 100keV.  I suppose the emission at that energy is very weak. 

The U Kb1 line is 111.3 keV. 

http://www.epsci.ameslab.gov/etd/technologies/projects/xray/K-edge_final_report.pdf

bc thinks the 100 keV definition is rather arbitrary.



On 2010, Mar 28, , at 20:30, Michael Edmiston wrote:

> In John Denker's first post on this topic he said,
>
> "The usual definitions revolve around energy aka frequency
> aka wavelength;  anything below 100 keV is an X-ray
> while anything above 100 keV is a gamma:
>
> This was the main point in John's post that I was objecting to in my second 
> post.  His energy-based distinction between gamma rays and x-rays is clearly 
> incorrect.  It's interesting that in his next post he didn't mention this at 
> all.  Rather, he focused the discussion only toward the annihilation 
> discussion.  John, are you conceding that your x-ray versus gamma-ray 
> statements were incorrect?