Date: Mon, 9 Apr 2018 15:36:56 +0200
Dear Joachim,
Thank You for explenation however I am still not sure how to understand
momentum spread especially for flat beam which I am using. Can You please
advise what this parameter means and what is the correlation between it and
beam shape?
Best regards,
Agnieszka Witkowska
2018-04-06 10:38 GMT+02:00 Joachim Vollaire <joachim.vollaire_at_cern.ch>:
> Dear Agnieszka,
>
>
>
> Be careful, when you specify the photon beam energy for the line at 186
> keV, you are using a photon energy of 186 keV with a momentum spread of
> 1.608 GeV ! So this will explain why you have totally different energy
> spectra in the two cases.
>
> Also note that for comparison of RADDECAY and direct photon emission you
> should account for the emission probability (Ra-226 is an alpha emitter and
> the emission of the 186 keV g has a few percent probability). In addition,
> the approach with RADDECAY will also give the contribution of the other
> isotopes in the decay chain of Ra-226.
>
>
>
> === Chain with 99.9599 %
>
> 88-Ra-226 (100% Alpha) T1/2=5.05e+10
>
> 86-Rn-222 (100% Alpha) T1/2=330000
>
> 84-Po-218 (99.98% Alpha) T1/2=186
>
> 82-Pb-214 (100% BetaMinus) T1/2=1610
>
> 83-Bi-214 (99.98% BetaMinus) T1/2=1190
>
> 84-Po-214 (100% Alpha) T1/2=0.000164
>
> 82-Pb-210 (100% BetaMinus) T1/2=7.03e+08
>
> 83-Bi-210 (99.9999% BetaMinus) T1/2=433000
>
> 84-Po-210 (100% Alpha) T1/2=1.2e+07
>
> 82-Pb-206
>
>
>
>
>
> Have a nice day
>
> Joachim
>
>
>
>
>
> *From:* Agnieszka Witkowska <witkowskaagnieszka07_at_gmail.com>
> *Sent:* 04 April 2018 22:32
> *To:* Joachim Vollaire <joachim.vollaire_at_cern.ch>
> *Cc:* FLUKA discussion <fluka-discuss_at_fluka.org>
> *Subject:* Re: [fluka-discuss]: RADDECAY output
>
>
>
> Dear Joachim,
>
>
>
> Thank You for help! In both cases in the output I filtered all particles
> by electrons (I hope I have done it correctly). For the simulation without
> RADDECAY card I used main energy line of radium 226. For simulation with
> RADDECAY card I used radioisotope of radium 226. I attached both of my
> input files.
>
>
>
> Best regards,
>
> Agnieszka
>
>
>
>
>
> 2018-04-03 22:23 GMT+02:00 Joachim Vollaire <joachim.vollaire_at_cern.ch>:
>
> Dear Agnieszka
>
>
>
> Looking at the output, it looks like you have a high energy beam as
> primary particle. So with no RADDECAY card, if you score ALLPART (I can't
> tell from the information you provide), you will get the contribution from
> the "prompt part" of the transport (contribution of secondary particles
> with high energy depending on the initial beam properties) and the
> contribution of radioactive nuclei decay (photons, electrons, positrons
> emitted following the radioactive decay with typical energies lower than a
> few MeV).
>
>
>
> Now if you have the RADDECAY (and maybe DCYSCORE associated to the scoring
> card ?), then you will filter the contribution of the prompt part and score
> only the contribution of particles from the radioactive decay. As it
> involves the nuclei de-excitation it explains why the contribution only
> appears in the lowest energy bin. If this is not the possible explanation,
> better to send your input file.
>
>
>
> Hoping this help
>
> Joachim
>
>
>
>
>
>
> ------------------------------
>
> *From:* owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it]
> on behalf of Agnieszka Witkowska [witkowskaagnieszka07_at_gmail.com]
> *Sent:* 03 April 2018 21:18
> *To:* FLUKA discussion
> *Subject:* [fluka-discuss]: RADDECAY output
>
> Dear Fluka Users,
>
>
>
> I do not understand how to read the output while using RADDECAY card. I am
> using USRTRACK card for scoring and I am obtaining results only in one bin:
>
>
>
> [image: Obraz w treści 1]
>
>
>
> and without RADDECAY in all bins:
>
>
>
> [image: Obraz w treści 2]
>
>
>
> Can You please explain what is the reason behind it?
>
>
>
> Best regards,
>
> Agnieszka
>
>
>
>
>
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