I have a follow-up question related to EM-ENERGY: When I compared two cases
where in the first case,
- the gamma and electron fluence is one order of magnitude higher than that
of the second case and
- the neutron fluence is several orders of magnitude lower than that of the
second case,
the fraction of energy deposition going into EM-energy is actually similar.
Based on my understanding, more electrons and gammas mean more EM-energy
deposition. I see this type of discrepancy consistently between the
EM-energy and particle spectra. Do you know why it is like that? Thanks!
(Here, I use track-length fluence and we can assume that the shape of the
energy spectrum is similar but just the magnitude differs. The probability
of generating other types of particles is low.)
Thank you for your help!
On Wed, May 6, 2020 at 9:56 AM Answers <answers_at_pcfluka.mi.infn.it> wrote:
> Hello
> EM-ENERGY includes energy depositions from electrons (including delta
> rays) positrons and photons. It does not include ion recoils. It does not
> include "continuous" , meaning below delta-threshold, ionization energy
> losses.
> NIEL: maybe you can have a look to the slides from 8 onwards in the
> Advanced materials lectures in the latest advanced fluka course
>
> https://agenda.infn.it/event/20624/contributions/105900/attachments/68621/85097/AdvancedMaterialsScoring2019.pdf
> Regards
> P
> On Sat, 2 May 2020, Tan Shi wrote:
>
> > Thank you for your response. Just two follow-up questions:1. What is
> > included in EM-ENERGY exactly? Does it include energy loss from ion
> recoils
> > induced by neutron scatters?
> > 2. What is included in NIEL? It just says non-ionizing radiation loss in
> the
> > manual, Could you please clarify a little more?
> > Thanks!
> >
> > On Fri, May 1, 2020 at 8:41 AM Answers <answers_at_pcfluka.mi.infn.it>
> wrote:
> > Hello
> > no: EM-ENERGY, and more generally ENERGY, include ALL energy
> > depositions,
> > including non-ionizing ones.
> > For neutrons < 20 MeV, the recoils are included in the deposited
> > kerma,
> > it means that they are not transported and the energy is
> > included in
> > "ENERGY" scoring. The NIEL in this case is the one calculated by
> > the NJOY
> > (Nuclear data processing system) code.
> > Regards
> >
> > On Thu, 23 Apr 2020, Tan Shi wrote:
> >
> > > Hi everyone,
> > > Is it true that the sum of EM-ENRGY and NIEL-DEP (energy
> > deposition
> > > from non-ionizing radiation) should be equal to the total
> > energy deposition?
> > > I noticed that this relation does not really hold.
> > > Also, I assume that neutron recoil energy is considered
> > as
> > > non-ionizing radiation if the recoil does not produce further
> > radiation above
> > > the threshold?
> > >
> > > Thank you very much for the help!
> > >
> > > Best,
> > >
> > > Tan Shi
> > >
> > > --
> > > Postdoctoral Research Fellow
> > >
> > > Department of Nuclear Engineering and Radiological Sciences
> > >
> > > University of Michigan
> > >
> > >
> >
> >
> >
> > --
> > Postdoctoral Research Fellow
> >
> > Department of Nuclear Engineering and Radiological Sciences
> >
> > University of Michigan
> >
> >
--
Postdoctoral Research Fellow
Department of Nuclear Engineering and Radiological Sciences
University of Michigan
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Received on Sun Jun 07 2020 - 09:43:13 CEST