RE: [fluka-discuss]: Radioisotopes of Co60 Cs137 with RADDECAY

From: Joachim Vollaire <>
Date: Wed, 4 Jul 2018 13:25:39 +0000

Dear Aman

A few things, first to visualize the emission spectra of Co-60 it would make sense to increase the higher energy limit of your USTRACK card as the main gamma rays are at 1.1 and 1.3 MeV.
Concerning the structures you mention, this corresponds to the energy deposited in a detector setting (gamma spectrometrer, scintillator…) when you place a source in front of it. What you simulate and visualize (in air) in the raw radiations emitted due to the particle decays not the corresponding interaction in matter. If you want to reproduce a detector response (distribution of deposited energy) you need to simulate the active part of the detector and look at the capabilities of the DETECT Card.


From: <> On Behalf Of Aman Sharma
Sent: 04 July 2018 14:04
To: fluka-discuss <>
Subject: Fwd: [fluka-discuss]: Radioisotopes of Co60 Cs137 with RADDECAY

Dear FLUKA Experts,

In reference to earlier conversation of Luigi and Agnieszka, I would like to mention here that same problem has been faced by me. Could someone may assist to resolve the problem of observing complete gamma ray spectrum (including Compton edge, backscatter peak etc.) of radioisotopes.


Dear Luigi,

I tried once again to check the spectrums with EMFCUT and RADDECAY and I have no idea why I am not able to get reasonable results for isotopes Ra226 and Co60. For Cs137 it looks fine (one main peak for 662keV).

Best regards,

2018-06-17 20:42 GMT+02:00 Luigi Salvatore Esposito <<>>:
Dear Agnieszka,
this topic was discussed here

Best, luigi

On 17 Jun 2018, at 20:00, Agnieszka Witkowska <<>> wrote:

Dear Luigi,

Thank You, I read the presentation and set up values for electron and gamma threshold however I am getting such error message:
<Screenshot from 2018-06-17 19-58-41.png>

What does it mean?

Best regards,

2018-06-16 18:22 GMT+02:00 Luigi Salvatore Esposito <<>>:
Dear Agnieszka,
please keep the mail exchange on the list in order that also other can profit.

Concerning your question, please bear in mind that a transport transport if always applied in a condensed history approximation used in a Monte Carlo.
Appropriate cuts depend on your application.
This is discussed in this lesson given at last FLUKA course

If you really want to the full electron spectrum, place the radioactive source inside your scoring region (i.e. change your setting of the BEAMPOS card).

Hope this could help.
Cheers, luigi

On 14 Jun 2018, at 18:10, Agnieszka Witkowska <<>> wrote:

Dear Luigi,

Thank You, missing EMFCUT probably explains all discrepancies in my calculations. How should I set up DEFAULTS card and EMFCUT card to make sure I will score all electrons (I need them for scoring with the model of high-pressure ionization chamber, so I believe I need even low energy electrons produced)? Should I just leave EMFCUT as blank with default settings? I read the manual and it is not clear for me....

Best regards,

2018-06-14 1:03 GMT+02:00 Luigi Salvatore Esposito <<>>:
Dear Agnieszka,
could you be more specific why the results are not correct?

I ran your Co60 input after having added a USRTRACK to score also photon fluence.
And I see the two photon peaks at 1.17 and 1.33 MeV.

The low energy electrons are not transported to the scoring region because of transport threshold that is
100 keV since you used PRECISIOn as DEFAULTS (it is recommended to set explicitly its value with EMFCUT, which is not present in your input).

Cheers, luigi

> On 12 Jun 2018, at 13:41, Agnieszka Witkowska <<>> wrote:
> Dear Fluka Experts,
> I created input file with cylindrical target filled with air to check the spectrum of Cs137 and Co60 with RADDECAY card. I used USRTRACK card and scored electrons in the target, however I obtained really "strange" results not looking like spectrums of the requested isotopes. Can You please advise what is wrong in my inp files and why I cannot get correct results?
> I attached my both inp files and graphs.
> Best regards,
> Agnieszka
> <Cs137_spectrum_check.inp><Cs137_spectrum_check.png><Co60_spectrum_check2.inp><Co60_spectrum_check2.png>

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Received on Thu Jul 05 2018 - 01:11:38 CEST

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