[gate-users] Constant Energy resolution for solid-state detectors

[Eric Vandervoort]

Hello,
Sorry, I just noticed a minor error in what I just said you should have:
outputPulse->SetEnergy(G4RandGauss::shoot(inputPulse->GetEnergy(),m_coeff/2.35));
to give a FWHM of X keV. The second term is the sigma of the Gaussian.
Eric


> Hello,
> The most simple way might be to change the source code. If you are using
> the simple blurring digitizer module, i.e.,
>
> /gate/digitizer/Singles/blurring
> /gate/digitizer/Singles/blurring/setResolution X
> /gate/digitizer/Singles/blurring/setEnergyOfReference Y keV
>
> You could change the following scrap of code in GateBlurring.cc:
>
> m_coeff = m_resolution * sqrt(m_eref);
> GatePulse* outputPulse = new GatePulse(*inputPulse);
> outputPulse->SetEnergy(G4RandGauss::shoot(inputPulse->GetEnergy(),m_coeff*sqrt(inputPulse->GetEnergy())/2.35));
> outputPulseList.push_back(outputPulse);
>
> Just change it to:
>
> m_coeff = m_resolution;
> GatePulse* outputPulse = new GatePulse(*inputPulse);
> outputPulse->SetEnergy(G4RandGauss::shoot(inputPulse->GetEnergy(),m_coeff*sqrt(inputPulse->GetEnergy())/2.35));
> outputPulseList.push_back(outputPulse);
>
> That will give you a constant FWHM for the energy resolution of X keV.
> Cheers,
> Eric
>
>> Hi all,
>>
>> Since the electronic noise contribution is dominant over the uncertainty
>> in
>> the number of electron hole pairs generated from each interaction in
>> solid-state detectors (for examples, HPGe, Si, CZT , etc.),  a constant
>> energy resolution at all energy range deposited in the detector volume
>> should be required to simulate blurring of the energy spectrum instead
>> of
>> using FWHM = FWHMo x sqrt(Eo/E) for scintillation detectors (LSO, BGO,
>> NaI,
>> etc.).
>> If you know how to use constant blurring for all energy range, please
>> let
>> me
>> know that.
>>
>> Thank you for your help in advance.
>> Best,
>> Sang-June Park
>> _______________________________________________
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>> gate-users at lphe1pet1.epfl.ch
>> http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
>>
>
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