[Gate-users] Problem for creating source of 131 I type histogram

[Thibault Mauxion]

Hello, 

don't know if you've fixed your problem already. Don't have that much time to go deeper in your files but at first look, you should probably: 

- complete your beta spectrum. The data you use (density probably) seem correct but you're missing the end of the spectrum at higher energy (check the maximum b energy for 131I). 
- the intensity should correspond to the number of particle that is emitted by each type of particle (around 1 for beta,0.76 for monoenergetic electrons and 1.8 for photons, I think). The value itself is not important. Only the ratio matters. 
- you may also wanna change the position according to you own phantom if this has not been already done.  


What i usually do when i create a new source file is to check the total energy that is deposited in a large high density phantom. If you didn't do all wrong, you should obtain about the same energy as the one that is theoretically emitted (mean). I do it for each source type separately. 

Hope this helps. 

Best regards 

Thibault 


Le 12 nov. 2012 à 19:13, juan camilo bedoya tobon a écrit :

> 
> 
> Good afternoon
> 
> My name is Juan Camilo Bedoya, in the moment i am realizing a simulation of the source de 131 I in Gate V 6.1, I was watching  the example of internal dosimetry; but i do not undestand how to build a source type histogram.
> 
>  i want I would like to ask your help again,  because I still do not understand how to make my source.
> 
> I send an attached scheme as make the source of I-131; with the data of Nudat (I131.mac), but still I have some doubts:
> 
> what parameters should I use to build the  density probability  function in the case of beta decay.
> I do not understand how to define the parameter setIntensity.
> 
> I would like to give me your opinion on this attachment, to correct it if necessary.
> 
> Additionally attached internal dosimetry example I mentioned above. (mac.tar.gz)
> 
> I hope I can help.
> 
> thank you very much.
> 
> 
> 
> <I131.mac><Source Nudat.ods><mac.tar.gz>

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