RE:[fluka-discuss]: Summation peak effect in FLUKA

From: Francesco Cerutti <>
Date: Sat, 24 Oct 2015 21:19:46 +0200

If your primary particle is a radionuclide - to be simulated in
semi-analogue mode - that generates a decay gamma cascade, you can look at
single energy deposition events in your detector region by the user
routine comscw.f (requiring a USRBIN ENERGY scoring and a USERWEIG card).
There you can write your own code to dump into a file information about
the particle that deposits energy (using the variables available in
(TRACKR)) and the deposition time (ATRACK). The latter will allow you - at
postprocessing level - to discriminate or to sum signals based on the time
resolution of your detector.
Note that, for each different history, the radionuclide's decay happens at
a different random time ATRACK, consistent on average with its lifetime.

Hope it helps

Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Sat, 24 Oct 2015, Trinh Ngoc-Duy wrote:

> Dear Sir,
> Thanks you for your answer.
> In fact, i have already know how to simulate radioactive decay in FLUKA.
> But for my case (simulation of Gamma detector (energy deposited in a detector for each gamma ray entered the detector)), so i just want to know how to score the energy deposition of each particle in a detector ?
> Otherwise, for a gamma detector, there are a possibility of more than one gamma from decay go into detector at the same time and deposited it's energy. We can not difference it, so we obtain the energy pic = sum of all of theses gammas energies (summation effect). Hence, i would like to know if FLUKA can simulate this phenomena ?
> Sincerely.
> Ngoc Duy TRINH, GANIL, Frace
> ________________________________________
> De : Francesco Cerutti []
> Envoyé : samedi 24 octobre 2015 17:05
> À : Trinh Ngoc-Duy
> Cc :
> Objet : Re: [fluka-discuss]: Summation peak effect in FLUKA
> Dear Ngoc-Duy,
> I'm not sure I fully understood your needs.
> With FLUKA you can activate radionuclide decay by RADDECAY (and associated
> cards, see the manual) and score the 'true' spectrum of decay gammas
> entering [or travelling over] a detector region (by USRBDX/USRYIELD [or
> USRTRACK] linked to DCYSCORE), either at a given cooling time in case
> radionuclides are produced in a prompt irradiation stage (WHAT(1)=1.0 in
> RADDECAY) or time-integrated in case of a radioactive source
> (semi-analogue mode i.e. WHAT(1)>1.0). In the first case you can also get
> the radionuclide activities (by RESNUCLE as well as USRBIN).
> Best
> Francesco
> **************************************************
> Francesco Cerutti
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
> On Thu, 22 Oct 2015, Trinh Ngoc-Duy wrote:
>> Dear FLUKA experts,
>> Do you know if FLUKA is able to simulate Summation peak effect in gamma spectroscopy ?
>> If yes, could you told me how to do to active/use this option.
>> Thanks in advance for your answer.
>> Sincerely,
>> Ngoc Duy TRINH, GANIL, France

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Received on Sat Oct 24 2015 - 22:33:43 CEST

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