# RE: [fluka-discuss]: Fwd: Gamma-ray experiment

From: Beatrice Pomaro <beatrice.pomaro_at_dicea.unipd.it>
Date: Sun, 09 Oct 2016 12:14:28 +0200

Dear Dr. Cerutti,

thank you very much for your explanation. I agree with you in the
definition of the energy deposition in a volume. Also I am using PHOTONs
as primary particle, yes.
If I want to compute the photon rate, the 60Co source working at
53Gy/h=0.01472 Gy/s and 1.2MeV, shall I transform 0.01472 Gy/s into
0.01472 W/kg where this quantity is per kg of the concrete sample placed
around the source (to be tested), is it correct?
Then I need to divide it for the electronic charge (1.6*10-19 C) and the
energy of the gamma rays (1.2*10+6 eV) so to obtain: 1.92*10+8
photons/(cm3 s) where cm3 is the volume of the concrete sample?
Is it correct?
Thank you in advance,
Best regards,
Beatrice
```---
**************************************************
Ing. Beatrice Pomaro
Universita' degli Studi di Padova
Dipartimento di Ingegneria Civile, Edile e Ambientale
Via F. Marzolo, 9 - 35131 Padova (Italy)
tel.: +39 049 8275592
e-mail: beatrice.pomaro_at_dicea.unipd.it
Il 07-10-2016 19:17 Francesco Cerutti ha scritto:
> Dear Beatrice,
>
> I miss the expected meaning of GeV/(cm2 s). Energy is deposited in a volume and with a cartesian or cylindrical USRBIN [*not* with a USRBIN per region] you get GeV/(cm3 primary) as you wrote. Multiplying by the photon rate (I assume you decided to use PHOTONs as primary particles instead of directly simulating the 60Co decay through ISOTOPE), you will get power deposition density (that can be expressed in W/cm3) and I would be pretty happy with that, with no need for a further manipulation by an ill-defined quantity.
> Do not hesitate to come back with your thoughts if in fact you turn out not to be happy.
>
> Cheers
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Thu, 6 Oct 2016, Beatrice Pomaro wrote:
>
>> Dear Anton,
>> thank you very much for your advice, may I ask you also about the output
>> results of a USRBIN score? We read in fact from the manual: "The results
>> from USRBIN are normalised per unit volume and per unit primary weight,"
>> does it mean that for energy deposition in order to get GeV/(cm2 s) out of
>> GeV/(cm3 primary) one needs to multiply Fluka result by the particle flux
>> (particle/s) and the length in direction orthogonal to the flux of the
>> region of interest for the scoring?
>> Thank you in advance for your explanation,
>> Best regards,
>> Beatrice
>>
>> Il 27-09-2016 15:49 Anton Lechner ha scritto:
>>
>> Dear Beatrice,
>>
>> Running your input file, one gets following error message:
>>
>> *** Too many terms in parenthesis expansion ***
>> *** Execution terminated ***
>>
>> I think the message is quite self-explaining. The issue lies in
>> the definition of the second zone of the rAir region. As a good
>> practice, I would try not to use too many parenthesis (you can
>> equally define the geometry without using any parenthesis at
>> all). Also note that if you have too many bodies in a zone
>> definition this can also slow down the simulation. It is better
>> to have more zones with fewer bodies than to have one zone with
>> many bodies.
>>
>> Besides, on the EMFCUT card you set the production cuts for
>> e-/e+ and photons to 0. Note that physics models are no longer
>> applicable at very low energies and one should respect the
>> minimum values recommended in the manual. I quote:
>> "The minimum threshold energy for transport and production of
>> photons is 100 eV. For electrons and positrons, it is 1 keV."
>>
>> Cheers, Anton
>>
>> ____________________________________________________________________________
>> From: owner-fluka-discuss_at_mi.infn.it
>> [owner-fluka-discuss_at_mi.infn.it] on behalf of Beatrice Pomaro
>> [beatrice.pomaro_at_dicea.unipd.it]
>> Sent: 27 September 2016 15:00
>> To: fluka-discuss
>> Subject: [fluka-discuss]: Fwd: Gamma-ray experiment
>>
>> Dear Fluka experts,
>> I am trying to reproduce an irradiation experiment due to gamma-rays
>> from a Cobalt60 source.
>> I am using Flair. I can not run the input file because the 001.out
>> file stops before reading regions, while the file .out gives a
>> generic error message (that I am reporting here below):
>>
>> Dir: /home/flupix/Desktop/Prova
>> Cmd: /usr/bin/nohup /usr/local/fluka/flutil/rfluka -e
>> /home/flupix/Desktop/Prova/Prova.flair -M 2 Prova
>> \$TARGET_MACHINE = Linux
>> \$FLUPRO = /usr/local/fluka
>>
>> Initial seed copied from /usr/local/fluka
>> Running fluka in /home/flupix/Desktop/Prova/fluka_2030
>>
>> ======================= Running FLUKA for cycle # 1
>> =======================
>> /usr/local/fluka/flutil/rfluka: line 359: 2058
>> Aborted (core dumped) "\${EXE}" < "\$INPN" 2> "\$LOGF" >
>> "\$LOGF"
>>
>> No .err files are produced yet, since the analysis stops before.
>> I am attaching here my input file. Would you tell me what I am doing
>> Thank you in advance,
>> Best regards,
>> Beatrice Pomaro
>>
>> --
>> **************************************************
>> Ing. Beatrice Pomaro
>>
>> Universita' degli Studi di Padova
>> Dipartimento di Ingegneria Civile, Edile e Ambientale
>> Via F. Marzolo, 9 - 35131 Padova (Italy)
>> tel.: +39 049 8275592
>> e-mail: beatrice.pomaro_at_dicea.unipd.it
>> --
>> **************************************************
>> Ing. Beatrice Pomaro
>>
>> Universita' degli Studi di Padova
>> Dipartimento di Ingegneria Civile, Edile e Ambientale
>> Via F. Marzolo, 9 - 35131 Padova (Italy)
>> tel.: +39 049 8275592
>> e-mail: beatrice.pomaro_at_dicea.unipd.it
>>
>> --
>> **************************************************
>> Ing. Beatrice Pomaro
>>
>> Universita' degli Studi di Padova
>> Dipartimento di Ingegneria Civile, Edile e Ambientale
>> Via F. Marzolo, 9 - 35131 Padova (Italy)
>> tel.: +39 049 8275592
>> e-mail: beatrice.pomaro_at_dicea.unipd.it

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Received on Sun Oct 09 2016 - 14:00:22 CEST

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