Re: [fluka-discuss]: Geometry axes and output of FLAIR

From: Anna Ferrari <>
Date: Sun, 04 Oct 2015 15:50:01 +0200

Dear Mr. Arif Efendi,
  first, please mantain the discussion public on the list... it is easier to
address the problems like that.

  I ran your input, and I could correctly generate your USRBIN output file(s).
So, your input is correct... you should find in the directory where you run a
file prelimenary001_fort.21 (last time), or prelimenary001_fort.50 (now). This
is the file (one of the files if you send several runs) to be processed to
obtain the bnn file, but this you know.
...question: do you have enough space in your directory to write the output?



Am Thu, 1 Oct 2015 03:18:56 +0000 schrieb "M. ARIF EFENDI"
> Dear Ms. Anna Ferrari,
> Thank you so much for your kind reply Ms. Anna.
> it really help me.
> I already changes the sdum to NEGATIVE in the BEAMPOS card and changes the
>photon energy to 0.02.
> But the USRBIN files still not generated.
> Can you checked it again for me?
> I attach in this email my .flair and .inp files
> Your help is really my expectation.
> Best regards
> M. Arif Efendi
> ________________________________________
>From: Anna Ferrari <>
> Sent: Wednesday, September 30, 2015 2:57 PM
> To: M. ARIF EFENDI; Thiago Viana Miranda Lima
> Cc:;
> Subject: Re: [fluka-discuss]: Geometry axes and output of FLAIR
> Dear M. Arif Efendi,
> here some considerations about your problem.
> (a) Don't have this doubt about the reference system: as already pointed out
> by Thiago Lima, you can chose the orientation you want. If you read the
> manual you will not find any mention about gravitational effects in the
> vertical direction...then chose your beam axis following your convenience.
> (b) ...but please do it correctly! I gave a look at your input: all your
> geometry -included the water phantom that you want to irradiate- is at
> negative z values, while you have sent the beam in the opposite direction.
> this reason you get an empty USRBIN!!! You have to put sdum=NEGATIVE in the
> BEAMPOS card in order to get correct results (I got it with your input).
> Another point: what is the real photon energy of your beam? I think you
> to simulate a 20 MeV beam, but you wrote 20 GeV... remember that the energy
> units in FLUKA are GeV.
> (c) About the DICOM: my suggestion is to postpone for the moment this matter
> -which is advanced, I suspect that in a first analysis you don't need it
> really- and to go first through the material of the FLUKA courses, which you
> find online (for example I would go first through this
> and the related exercises)
> Hope it helps,
> regards,
> Anna
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Anna Ferrari
> Institute of Radiation Physics
> Helmholtz-Zentrum Dresden-Rossendorf e.V.
> Am Wed, 30 Sep 2015 03:47:45 +0000 schrieb "M. ARIF EFENDI"
> <>:
>> Dear Mr. Thiago Viana Miranda Lima,
>> Thank you so much for your kind reply.
>> 1) but what the vertical direction in FLUKA? z axes or y axes? and is that
>>fluka use gravity calculation for simulate?
>> 2) I already use USRBIN card, but didn't found the data when try to merge it
>>(I attach the picture). I use 21 bin. can you explain to me about BIN and ASC
>>in unit?
>> 3) Can you send to me the courses materials (pdf) that related to DICOM? I
>>use the latest FLAIR but didn't found the DICOM
>> I attach in this email my .flair and .inp files
>> Best Regards
>> ________________________________
>>From: Thiago Viana Miranda Lima <>
>> Sent: Tuesday, September 29, 2015 5:40 PM
>> Cc: Vasilis Vlachoudis;;
>> Subject: Re: [fluka-discuss]: Geometry axes and output of FLAIR
>> Dear Mr Arif Efendi,
>> Answering your questions:
>> 1) The orientation you can chose whatever you want as you can define the
>>orientation of the beam and it should follow the same as the linac head.
>> 2) What you are looking for is a card called usrbin, but I would suggest you
>>to have a look at the manual for how to use the card. And another suggestion
>>is to look at past courses materials as it will examples of interesting
>>tools that you may want to use for example importing DICOM files to fluka and
>>visualising then. There should also have information on visualisation of
>>usrbin with flair.
>> Best wishes
>> Thiago
>> On 29 Sep 2015, at 10:44, M. ARIF EFENDI
>><<>> wrote:
>> Dear FLUKA expert,
>> My name is M. Arif Efendi.
>> I'm studying in prince of songkla university at nuclear physics.
>> I will use FLAIR for my research.
>> My research is simulation of photon dose in medical LINAC.
>> I am quite new fluka user.
>> I have two questions for my problem.
>>First questions is about geometry axes in fluka. I want to simulate the head
>>of linac.
>> The beam start in the top and come to the bottom (vertical direction).
>> I make in my simulation geometry that it use z direction. Is that correct to
>>define the vertical direction as z axes?
>> I attach in this email my .flair and .inp file.
>> The second questions is how to see the output file and scoring the dose in
>> I want to get the plot about relative percent dose as the distance (cm) and
>>percentage depth dose as depth (cm).
>> Your help is really my expectation.
>> Best Regards
>> M. Arif Efendi
>> <prelimenary.flair><prelimenary.inp>

Anna Ferrari
Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf e.V.

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Received on Sun Oct 04 2015 - 17:05:10 CEST

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