[Gate-users] Noise parameters

[David GUEZ]

Hello,
actually, I don't understand what you want to set up... The setLambda 
parameter (7.57 mus in your exemple) is equal to the mean time between 
to consecutives noise events in a Poisson distributed noise source. The 
inverse of this value is the noise frequency, thus.
Concerning, the eventID number, it is due to the fact that noise events 
are not produced by physical interaction of particles with detectors 
(which can be attached to a particle emission event number, which is 
eventID). The noise events are described as independent source of 
detector signal, not correlated to any physical particle emission, and 
are then marked with the special event number (-2).

N.B : A message of Soeren Dittrich had written, mentioned that infinite 
loop where observed using this module. I used it without problem 2 year 
ago, but may be new developpements invalidate it. I can't use GATE in my 
home for the time being, and thus, I was not able to check the problem. 
As soon as I get back a usable version of linux with ROOT/GATE working, 
I'll take a look on this problem (and on the setDepth problem you 
mentioned and that I were never able to investigate).

cheers.

D. Guez

Ashley Devarim a écrit :
>  
>  
> Dear Gate users,
>  
> I need help please, how can I set up the parameters of noise using the 
> following commands to reproduce a real case, especially noise time 
> distribution parameters  :
>  
>
> /gate/distributions/name energy_distrib
>
> /gate/distributions/insert Gaussian
>
> /gate/distributions/energy_distrib/setMean 450 keV
>
> /gate/distributions/energy_distrib/setSigma 1 keV
>
> /gate/distributions/name dt_distrib
>
> /gate/distributions/insert Exponential
>
> /gate/distributions/dt_distrib/setLambda 7.57 mus
>
> /gate/digitizer/Singles/insert noise
>
> /gate/digitizer/Singles/noise/setDeltaTDistribution dt_distrib
>
> /gate/digitizer/Singles/noise/setEnergyDistribution energy_distrib
>  
>  
> Also, I don't understand : The special event ID, event_ID= -2 , is 
> attributed for those noise events. why GATE consider noise events as a 
> separated events !!!  is that what happens in real life ?
>  
>  
> Looking forward to your answer
> and Thank you very much for your help
>  
> Ashley
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