[Gate-users] Optical Photons Detection

[Esteban Venialgo]

Dear Raphael Bögel,

I think that I had the same problem some time ago. I solve this issue 
using an old version of Gate (3.1.2). Here is the link with the 
explanation of the problem.

http://permalink.gmane.org/gmane.comp.science.opengate.user/1013

        regards, Esteban.



Raphael Bögel wrote:
> Dear Gate users,
>
> i think you may help me with a problem i don't get by with.
> I want to detect optical photons with an ideal apd.
>
> The system consists of an LSO crystal ideal apd behind it (x position).
>
> The problem: nearly all optical singles are located on the opposite side
> of the apd. 
>
> The profiles look like this:
>
> x location: peak .. low .. low .. low  <- exactly the opposite of what i
> expected
> y location: peak .. low .. low .. peak
> z location: peak .. low .. low .. peak
>
> Another consideration is that there are nearly no optical absorptions
> meassured, just "Transportation".
>
> The surface between the crystal and the apd is described by
> "perfect_apd".
> All other surfaces of the crystals are described by
> "polished_teflon_wrapped". I added both at the end of the mail.
>
>
> best regards,
> Raphael
>
>
>
>  <surface name="perfect_apd" type="dielectric_metal" sigmaalpha="0.0"
> finish="ground">
>     <propertiestable>
>       <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
>     <ve energy="4.08" value="0"/>
>     <ve energy="1.84" value="0"/>
>       </propertyvector>
>       <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
>     <ve energy="4.08" value="0"/>
>     <ve energy="1.84" value="0"/>
>       </propertyvector>
>       <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
>     <ve energy="4.08" value="0"/>
>     <ve energy="1.84" value="0"/>
>       </propertyvector>
>       <propertyvector name="REFLECTIVITY" energyunit="eV">
>     <ve energy="4.08" value="0.0"/>
>     <ve energy="1.84" value="0.0"/>
>       </propertyvector>
>       <propertyvector name="EFFICIENCY" energyunit="eV">
>     <ve energy="4.08" value="1."/>
>     <ve energy="1.84" value="1."/>
>       </propertyvector>
>     </propertiestable>
>   </surface>
>
>
>
>
>   <surface name="polished_teflon_wrapped" type="dielectric_dielectric"
> sigmaalpha="0.1" finish="groundbackpainted">
>     <propertiestable>	
>       <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
> 	<ve energy="4.08" value="1"/>
> 	<ve energy="1.84" value="1"/>
>       </propertyvector>
>       <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
> 	<ve energy="4.08" value="0"/>
> 	<ve energy="1.84" value="0"/>
>       </propertyvector>
>       <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
> 	<ve energy="4.08" value="0"/>
> 	<ve energy="1.84" value="0"/>
>       </propertyvector>
>       <propertyvector name="RINDEX" energyunit="eV">
> 	<ve energy="4.08" value="1"/>
> 	<ve energy="1.84" value="1"/>
>       </propertyvector>
>       <propertyvector name="REFLECTIVITY" energyunit="eV">
> 	<ve energy="4.08" value="0.95"/>
> 	<ve energy="1.84" value="0.95"/>
>       </propertyvector>
>       <propertyvector name="EFFICIENCY" energyunit="eV">
> 	<ve energy="4.08" value="0"/>
> 	<ve energy="1.84" value="0"/>
>       </propertyvector>
>     </propertiestable>  
>   </surface>
>
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