[ RadSafe ] Bending Gamma Rays

[Bob Cherry]

My thesis chair at the University of Michigan specialized in beta- and
gamma-ray spectroscopy. He had a large thin ultra-pure germanium crystal
that we used for precision measurement of gamma-ray energies. Just as a fine
grating diffracts visible light, the regularly spaced germanium atoms
diffract gamma rays. We calibrated it using the 411-keV gamma in Au-198.
Before the crystal finally cracked and became useless, we could measure
gamma-ray energies to five or six significant digits.

Bob C

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of JPreisig at aol.com
Sent: Thursday, September 13, 2012 12:23 PM
To: radsafe at health.phys.iit.edu
Subject: Re: [ RadSafe ] Bending Gamma Rays

Hmmmm,
 
       Maybe you should have a look at the  book Gravitation by Misner,
Thorne and Wheeler.
Serious Heavy Lifting --- the book is immense.  Intellectually, it has more
math in it than I have learned in
57 years.  Read Part 1 (if you can!!!) first.
 
      It discusses bending of light etc. by the  Sun.  Refracting gammas
with a prism???
Interesting...  EM Waves refracting, EM Waves being bent in a general
relativisitic sense.
 
      Compared to Misner, Thorne and Wheeler,  Sakurai's book of
Relativistic Quantum Mechanics, is light reading.  It discusses pair
production, Compton Scattering, Photoelectric Effect at a high level.
It even addresses the infamous Raman Scattering.
 
     Joe Preisig
 
 
 
In a message dated 9/12/2012 5:59:21 P.M. Eastern Daylight Time,
cehn at aol.com writes:

Anyone  try refracting gammas with a prism?  The French are doing it.  See:

http://www.ill.eu/news-events/press-room/press-releases/gamma-ray-optics-a-v
iable-tool-for-a-new-branch-of-scientific-discovery-02052012/

Not  sure how it works, but others (e.g., LBL) have worked on focusing
x-rays.  I suspect the angles are small.






Joel  I. Cehn,  CHP
joelc at alum.wpi.edu

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