Hi Francois,
Regarding the direction of the isotope, FLUKA reports {0,0,1}, but speed is zero because the assumption is that decay isotopes are at rest (thanks Francesco for pointing this out), so yes, direction settings are irrelevant. The decay radiation should be emitted isotropically as far as I can tell.
Please remember to use RADDECAY with What(1)>1 to get any kind of result.
-M
> On Oct 30, 2019, at 12:04 PM, Santana, Mario <msantana_at_slac.stanford.edu> wrote:
>
> Hi Francois,
>> On Oct 30, 2019, at 2:37 AM, Bierlaire-Hancotte François <francois.bierlaire-hancotte_at_epfl.ch> wrote:
>>
>> Dear FLUKA users,
>>
>> I am a beginner with FLUKA and I am using flair for everything (writing cards, computations and plots). The simulation I try to make is some computation of the absorbed dose of a Co-60 source inside a cavity and I have some questions:
>>
>> 1) The source is a cylinder so I used CYLI-VOL in the first BEAMPOS card. In the second BEAMPOS card, are the x, y, z coordinate located in the center of the cylinder or at the same place than the RCC cards (center of one of the circular surface)?
>
> These are for the center of the source unlike for RCC definition.
>>
>> 2) As the source is Co-60, I used ISOTOPE in the BEAM card. I see that an option of the divergence type (WHAT(3)) is isotropic. Is it ignored as the rest of the card because I choose ISOTOPE? Is the direction of the beam (cosx, cosy in the seconde BEAMPOS card) also ignored because it is isotropic?
> The fact that you use an ISOTOPE in the BEAM card does NOT imply any preset on the direction of emission of the decayed atoms (in FLUKA). If you don’t specify the direction/distribution, by default isotopes will be emitted in the positive z-axis.
>>
>> 3) As I specified that the source is a cylinder of Co-60 with the BEAM, BEAMPOS and HI-PROPE cards, should I put in addition geometry cards for a cylinder of cobalt at the same place and size as the beam source or is it redundant?
> The source card only takes care of generation of particles, so you do need to define the actual source geometry for accurate transport via the standard geometry cards.
>>
>> 4) In order to compute the absorbed dose, I choose DOSE as the type of particle (WHAT(2)) in the USRBIN card. For a radioactive source with HI-PROPE, RADDECAY and DCYSCORE cards, the unit of DOSE is GeV/g per Bequerel per second (=> GeV/g per emitted particles), is that right?
> The dose is expressed as [GeV/g]/primary. So yes, it would correspond to [GeV/g]/[Bq * s] where primary = disintegration.
>>
>> 5) What I would like to do is to mesure the absorbed dose only at a few given points. How should I do this? I though of putting new bodies, like SPH or RPP, at those points of interest than use USRBIN region (or region point) but I am not sure of how this part of the card works.
> You may define extra regions for scoring and use USRBBIN to score dose by region, but you may also score DOSE in cylindrical or hexahedral grids, including grids with only one bin.
>>
>> Best regards,
>>
>> François
>
> -M
>
>>
>>
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Received on Thu Oct 31 2019 - 00:14:35 CET