Re: [Phys-l] Gamma-Gamma Coincidence

[Bernard Cleyet <bernardcleyet@redshift.com>]

I read I have a bit to learn.  The reason I thought emison above 100 keV would be weak was I thought if the absorption edge (K) was only about 111 keV that would require a transition from the "vacuum" to a 1s vacancy.  I didn't know that the energy from an M to K would be so great.  Also  my table doesn't include Z > 92 for Ka1, Ka2, or Kb1.  

http://www.med.harvard.edu/JPNM/physics/refs/xrayemis.html

http://www.iupac.org/publications/analytical_compendium/Cha10sec348.pdf


bc


On 2010, Mar 29, , at 00:09, Michael Edmiston wrote:

> K-beta-2 x-rays become more than 100 keV at atomic number 87 (Fr), and 
> K-alpha-1 x-rays become more than 100 keV at atomic number 93 (Np).  The 
> highest-energy x-ray listed in the table at the link given below is 156.2 
> keV for atomic number 104 (Rf).