Re: [fluka-discuss]: Dose in a region

From: Amor Romero <amor1987romero_at_gmail.com>
Date: Tue, 9 Jul 2019 11:47:26 +0200

Dear fluka experts,

I've made the operations that you recommend me to obtain the value of dose
in a region, but the resulted dose in the simulation differs of the real
dose in a factor of 98.9. I'm comparing the dose in a region with the dose
measured by an ionization chamber.

I don't know where could be the error. Maybe the problem is that I consider
active option instead of semi-analogue?

Thanks in advance and best regards,
Amor

El mié., 19 jun. 2019 a las 12:51, Thomas Frosio (<thomas.frosio_at_cern.ch>)
escribió:

> Dear Amor,
>
>
>
> Indeed, you have to perform these operations on the score except if you
> used the IRRPROFI card in which you add the exposure time, and the source
> activity.
>
> In this case you just have to divide by the volume of the region and
> convert the GeV/g in the unit of your choice.
>
>
>
> Best regards,
>
> Thomas Frosio
>
>
>
> *From:* Amor Romero <amor1987romero_at_gmail.com>
> *Sent:* Wednesday, June 19, 2019 12:43 PM
> *To:* Thomas Frosio <thomas.frosio_at_cern.ch>
> *Subject:* Re: [fluka-discuss]: Dose in a region
>
>
>
> Dear Thomas,
>
>
>
> If I understand right, I have to do:
>
>
>
> - Divide by volumen of the region in cm^3
>
> - Multiply by the activity of the source in Bq
>
> - Conversion GeV/g to unit of my choice (rad)
>
>
>
> Is it correct? Are there more calculations that I need to consider to
> compare my experimental data with the simulation value? Maybe the exposure
> time?
>
>
>
> Thanks a lot.
>
> Best regards,
>
>
>
> Amor Romero
>
>
>
> El mar., 18 jun. 2019 a las 14:40, Thomas Frosio (<thomas.frosio_at_cern.ch>)
> escribió:
>
> Dear Amor,
>
>
>
> Your cobalt source with HI-PROP seems correct.
>
> For sure, using IRRPROFI card allows you to normalize the score with your
> cobalt source activity and time units.
>
> You just have to convert the GeV.cm^3/g, as detailed by Francesco, in the
> unit of your choice.
>
>
>
> Best regards,
>
> Thomas Frosio
>
>
>
> *From:* Amor Romero <amor1987romero_at_gmail.com>
> *Sent:* Tuesday, June 18, 2019 11:13 AM
> *To:* Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
> *Cc:* Thomas Frosio <thomas.frosio_at_cern.ch>; fluka-discuss_at_fluka.org
> *Subject:* Re: [fluka-discuss]: Dose in a region
>
>
>
> Hello,
>
>
>
> First, I'm thankful to Francesco and Thomas for answering my questions. I
> attach my input if it could help you to answer my questions about dose per
> region.
>
>
>
> Then, I would like to ask you about the way I'm defining the Cobalt
> source. Is it correct?
>
>
>
> If I used then the IRRPROFI card, do I need normalize the score with the
> activity of my Cobalt source?
>
>
>
>
>
>
>
> Kind regards,
>
>
>
> Amor Romero
>
>
>
> El lun., 17 jun. 2019 a las 19:26, Francesco Cerutti (<
> Francesco.Cerutti_at_cern.ch>) escribió:
>
>
> Hallo
>
> the output of the USRBIN *per region* is NOT normalized by the region
> volume, which is unknown to FLUKA, so, when you ask for DOSE, you will
> rather get GeV cm^3/g per primary particle.
>
> See also
> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10023.html
>
> Kind regards
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. +41 22 7678962
>
> On Mon, 17 Jun 2019, Thomas Frosio wrote:
>
> >
> > Dear Amor,
> >
> >
> >
> > I am not sure if I can answer your question without the input data as
> example.
> >
> > However, I can give you some hints, but feel free to send your input
> data if you need further details.
> >
> >
> >
> > Regarding your first questions, the differences between your
> experimental data and FLUKA’s values might
> > come from the score normalization per primary or the units of your score:
> >
> > DOSE score is given in GeV/g per primary particle.
> >
> > In your case, the primary particle are the nuclear transformations, if
> you used HI-PROP card to simulate
> > your 60Co source.
> >
> > So, your DOSE score corresponds to deposited energy in GeV/g per
> disintegration.
> >
> > You have to normalize this score to the activity of your 60Co source and
> to convert the GeV/g in J/kg.
> >
> >
> >
> > For your second question, it seems in your score you just selected from
> which volume to score but not the
> > ending volume.
> >
> > The right way to score in a region (TM34060 in your case) is your first
> example.
> >
> >
> >
> > Best regards,
> >
> > Thomas Frosio
> >
> >
> >
> >
> >
> > From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it>
> On Behalf Of Amor Romero
> > Sent: Wednesday, June 12, 2019 1:14 PM
> > To: fluka-discuss_at_fluka.org
> > Subject: [fluka-discuss]: Dose in a region
> >
> >
> >
> > Dear fluka/flair experts,
> >
> >
> >
> > I'm a beginning user and I am trying to measure the total dose, energy
> and fluence into a metallic box
> > when I use a 60Co source. My geometry is compounding to:
> >
> > - The real lab dimensions (porland and plaster)
> >
> > - A simplification of gamma radiator (lead, heavymetal, W... other
> materials)
> >
> > - Inside the radiator a recreation of real Co source.
> >
> > - The lead-aluminium box
> >
> > - Inside the box: Silicon cylinder with the same size of the real sensor
> that we have in our box.
> >
> >
> >
> > I'm trying to obtain the Dose in the sensor region. When I used this:
> >
> >
> >
> > USRBIN 12. DOSE -31. TM34060
> TM34060
> > USRBIN TM34060
> &
> >
> >
> >
> > I obtain a value but it not similiar with the experimental data.
> Experimental data is arround 600 rad and
> > with the fluka simulation we have in the order to mrad.
> >
> >
> >
> > And if I use this:
> >
> >
> >
> > USRBIN 12. DOSE -31.
> > USRBIN TM34060
> &
> >
> >
> >
> > I obtain 0.0 E+0
> >
> >
> >
> > Could you help me to find a solution?
> >
> > Thank you.
> >
> >
> >
> > Best regards,
> >
> >
> >
> > Amor Romero
> >
> >
> >
> > ALTER TECHNOLOGY TÜV NORD S.A.U.
> >
> > Mail: beca_pl3_at_altertechnology.com
> >
> > Mail: amor1987romero_at_gmail.com
> >
> > Web: www.altertechnology-group.com
> > Address: C/ Tomás A. Edison 4
> > PCT Cartuja
> > 41092 Sevilla - SPAIN
> >
> >
> >
> >
> >
>
>


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Received on Tue Jul 09 2019 - 12:58:47 CEST

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