Re: [fluka-discuss]: Re: Definition of Radioactive Target

From: Alberto Fasso <fasso_at_mail.cern.ch>
Date: Thu, 16 Jul 2015 16:22:50 +0200

Dear Nkanyiso,

everything is explained in detail (and, I think, very clearly) in
this Note to command BEAM in the Manual.

8) When the radiation source is a radioactive isotope, requested
    by SDUM = ISOTOPE and defined by command HI-PROPErt, special
    rules must be observed. Note that if a stable isotope is input,
    nothing will occur, and no particle will be transported. On the
    other hand, if the isotope is radioactive, it will be necessary
    to request decay in semi-analogue mode (command RADDECAY with
    WHAT(1) > 1). If RADDECAY is not requested, nothing will occur,
    and no particle will be transported. Commands IRRPROFI and
    DCYTIMES are not allowed: decay secondaries are sampled over
    the whole decay time from zero to infinity, and all scoring will
    refer to the time integral of isotope activity (dose, fluence,
    current, yield or residual nuclei PER DECAY, not the
    corresponding rates at particular decay times as it happens in
    the "activation study" mode).
    Important: to score any quantity, command DCYSCORE must be
    issued with WHAT(1) = -1, and must be applying to all relevant
    estimators and detectors. Without DCYSCORE, no scoring will
    occur. For time-dependent calculations (see TCQUENCH, TIME-CUT)
    it is to be noted that transport of isotope decay secondaries
    starts with an age equal to the time of decay.

Alberto

On Thu, 16 Jul 2015, NKANYISO ROBERT Mantengu wrote:

> Sorry Joachim, I'm confused again on how do I normalize my score quantities to my 230-Th source activity,
> because the scoring cards are scoring DOSE-EQ and the FLUENCE.
>
> Here is the input file.
>
> Regards
> N.R. Mantengu
>
> On Thu, Jun 11, 2015 at 11:44 AM, NKANYISO ROBERT Mantengu <3477531_at_myuwc.ac.za> wrote:
> Thank you Joachim, this is what I was looking for.
>
> Cheers,
> Nkanyiso
>
> On Wed, Jun 10, 2015 at 5:27 PM, Joachim Vollaire <joachim.vollaire_at_cern.ch> wrote:
>
> Hi Nkanyiso,
>
> Just to be sure, you want to use a radioactive isotope as a volumic source ? Not a particle
> beam, is this correct ?
>
>  
>
> If this is the case, in the example below I am defining a cylindrical shape Tl-204 source
> (you can overlay the source to a material in the geometry if the radionuclides are within a
> matrix material):
>
>  
>
> BEAM                                                               1.0ISOTOPE
>
> BEAMPOS          0.0      0.15       0.0      0.24       0.0          CYLI-VOL 
>
> BEAMPOS          0.0       0.0    -0.125                                       
>
> HI-PROPE         81.      204.
>
> *
>
> Activate the decay in semi-analogue mode
>
>  
>
> RADDECAY         2.0             
>
> *
>
>  
>
> Use -1.0 for the card below as you are in semi-analogue mode
>
>  
>
> DCYSCORE        -1.0        0.        0.    DR-All    DR-All          USRBIN
>
> *
>
> *
>
> USRBIN          10.0   DOSE-EQ     -45.0      80.0       0.4      80.0DR-All
>
> USRBIN         -80.0      -0.4     -80.0     160.0       1.0     160.0&
>
> *
>
>  
>
> Your results will be normalized per decay of the radionuclides defined with the HI-PROPE
> card. If you have a xxx Bq source then you have to normalize the score quantities to your
> source activity
>
> Hoping this help
>
> Joachim
>
>  
>
>  
>
> From: NKANYISO ROBERT Mantengu [mailto:3477531_at_myuwc.ac.za]
> Sent: 10 June 2015 12:03
> To: fluka-discuss_at_fluka.org
> Cc: Joachim Vollaire
> Subject: Definition of Radioactive Target
>
>  
>
> Dear FLUKA users,
>
> I have a problem with defining the radioactive target, where I will just measure the activity of
> the target without hitting it with a beam.
>
> Any idea will be appreciated.
>
> Regards
>
> N.R Mantengu
>
>
>
>
>

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Received on Thu Jul 16 2015 - 17:34:10 CEST

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