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Forum: Analysis
Re: Question Gaussian-like curve?
Re: None Re: Gaussian-like curve? (Vladimir Ivanchenko)
Re: None Re: Gaussian-like curve?
Date: 23 Sep, 2002
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

> *** Discussion title: Analysis
> Email replies to must include:
>   In-Reply-To: <"/analysis/17/1/1">
>   Subject: ...change this to be about your reply.
> Dear Sir,
> Having a very sharp peak would imply that the detector is very (if not,
> almost 100% percent) good in its energy resolution. This may be true for
> Germanium/Silicon detectors. But I am using a Sodium Iodide Detector
> which has 8 to 10 % energy resolution. So in one way, I expect to obtain
> a gaussin-like curve in the Histogram.

It is not true - if you take infinite CsI detector you will have near 100%
resolution. If you take small Si detector - you will have bad resolution.
For specific particles/energy one have to choose the size.
> I supposed that one needs the area of the fitted gaussian-like curve in
> order to calculate the FWHM and to obtain the energy resolution of the
> constructed detector? (i.e., say a cylindrical Sodium Iodide Detector)
> What about the energy fluctuation during the detection? How does one
> simulate this fluctuation so that he can obtain a gaussian like curve?

Default G4 simulation has all types of fluctuations. The results can seen
in examples - Em2, Em3...


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