[Gate-users] How to get the linear attenuation coefficients ?

[Joe Aoun]

Thank you Sebnem and Niklas for your fast answers !!

Well actually, I am using two materials in my GATE simulation, the Brain 
and the Skull.
These two materials are defined in the "GateMaterials.db" file by their 
density and the mass fractions of each element.

Now If I want to use the NIST database, then I will need the chemical 
formula of my material (brain & skull).
Does anyone know the chemical formula of the brain and the skull ?

If not, is there any program which takes as an input the mass fractions 
of the elements rather than the chemical formula of the compounds ?

Thank you in advance !!

Joe




sebnem erturk a écrit :
> Hi Joe,
>  
> You can use XCOM program  to learn linear attenuation coefficients. 
> (you can download this program from  below link)
> unit of linear attenueation coefficent is cm^-1.
>  
> μ_l is called the linear attenuation coefficient of the absorber. It 
> has dimensions (thickness)^-1 and usually is expressed in cm^-1
> http://physics.nist.gov/PhysRefData/Xcom/Text/XCOM.html
>  
> hope it helps,
>  
> sebnem
>
>
> On Fri, Aug 21, 2009 at 2:36 PM, Joe Aoun <joe.aoun at imag.fr 
> <mailto:joe.aoun at imag.fr>> wrote:
>
>     Dear Gate users,
>
>     Does anyone know how to get the linear attenuation coefficient
>     values of the different materials used in a GATE simulation ?
>     And what is the unit of the coefficients ?
>
>     Thank you for your help !!
>
>     Regards,
>
>     Joe
>
>     -- 
>     ============================================
>     Joe Aoun
>     Laboratoire TIMC-IMAG
>     Équipe GMCAO
>     Université Joseph Fourier - Faculté de médecine
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>
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> -- 
> Sebnem Erturk
> University of Pisa
> Applied Physics Dpt.
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