Re: Gamma rays

Dear Mina,

many thanks for pointing out the need for requesting isotope decay. It was
written in the manual, but it escaped my attention:

                 For (radioactive) isotopes, use the name ISOTOPE and specify
                 further the isotope properties by means of option HI-PROPErt.
                 In this case WHAT(1) and WHAT(2) are meaningless. If no
                 radioactive isotope evolution or decay is requested, or if a
                 stable isotope is input, nothing will occur, and no particle will
                 be transported.

Alberto

On Mon, 9 Jul 2012, Mina Nozar wrote:

> Dear Roser,
>
> To add to Alberto's instructions for defining 60Co (or any other radioactive source), I add the following:
>
> When I looked into this few months ago with the help of Sebastien and Joachim, I found out having a radioactive source
> requires the use of either a RADDECAY and a DCYSCORE card or a RADDECAY, DCYTIMES, and DCYSCORE cards.
> Without these, no decay particles are tracked.
>
> - If one uses 1 for WHAT(1) for RADDECAY card (Active), then radioactive decays are activated for requested cooling
> times and one should use DCYTIMES with requested times. This means you need to associate whatever distribution you are
> looking at via your choice of estimators, with a given decay time defined in the DCYTIMES card, using a DCYSCORE card.
>
> EX:
> RADDECAY 1. 3.
> DCYTIMES 30. 3600. 86400.
> RESNUCLE 3. -21. 74. 49. rTa27 1.RNTgt
> DCYSCORE 1. RNTgt RESNUCLE
>
> In the above, I am defining three decay times 30 sec, 1 hour, and 1 day. Using the RESNUCLE & DCYSCORE cards, I am
> looking at the activity in the rTa27 region, t=30 seconds.
>
>
> - If one uses 2 for WHAT(1) for RADDECAY card (Semi-Analogue), then radioactive decays are activated in semi-analogue
> mode and one needs only a DCYSCORE time using -1 for WHAT(1) to use the Semi-Analogue mode.
>
> EX:
> RADDECAY 2. 3.
> DCYSCORE -1. RNTgt RESNUCLE
>
>
> This is the extent of my understanding. I don't believe you can set the activity level of the source at the start of
> your run. I also do not have a good grasp of the Semi-Analogue mode.
>
> It would be nice if a section was added to the manual, explaining all the cards that NEED be used in order for setting a
> radioisotope (radioactive) source as the beam.
>
>
> Best wishes,
> Mina
>
>
> On 12-07-08 08:05 AM, Alberto Fasso' wrote:
>
> > Dear Roser,
> > gamma rays are photons.
> > To simulate a source of Gamma rays of 1.3 MeV, use a BEAM card with
> > WHAT(1) = 0.0013 and SDUM = PHOTON.
> > If the source is isotropic, set WHAT(3) = 7000.
>
>
>
> > For 60Co, this is an approximation, because 60Co doesn't emit one gamma of
> > 1.3 MeV, but two gammas, one of 1.173 MeV, and one of 1.332 MeV.
> > If you want to simulate accurately an isotropic 60Co source, use a BEAM card
> > with WHAT(3) = 7000., all other WHATs = 0., and SDUM = ISOTOPE, and a card HI-PROPE
> > with WHAT(1) = 27. and WHAT(2) = 60.
> >
> > Alberto
>
>
>>> Dear FLUKA users and experts,
>>> I would like to simulate the effects of gamma rays.
>>> -I need to simulate a source of Gamma rays of 1.3 MeV. (For exemple a 60Co source)
>>> -I also need to define the number of the incident photons.
>>> -This gamma rays interact with a 1.0 mm Si slab.
>>> My problem is that I didn't find how to simulate gamma rays. May you please
>>> help me? Thanks.
>>> Roser
Received on Tue Jul 10 2012 - 10:47:30 CEST