====== Gamma-ray attenuation ======
We have considered different materials for the  gas chamber. 
In order to estimate the attenuation of the gamma we have taken the attenuation coefficientes from [[http://www.nist.gov/pml/data/xraycoef/index.cfm|NIST]] webpage and calculated the attenuation in 3 mm of Aluminum and 3 mm of Stainless Steel (70% Fe, 18% Cr) for gamma energies between 1 keV and 20 MeV.

 {{ :gamma_attenuation2.png?300 |Gamma ray attenuation}} 

 Gamma attenuation in Aluminum and Stainless Steel {{:gamma_attenuation.xlsx|Excel Spreadsheet}}

 --- //[[perezlou@nscl.msu.edu|David Perez-Loureiro]] 2016/02/26 10:31//