Correct!
Paola
> Dear Experts,
>
> Just to confirm: whether the DOSE EQ will give the result in pSv/particle.
> I am scoring in R-Z binning.
> If I need to convert it for one Curie, i need to multiply it by (3.7E+10 *
> 3600) , I will obtain it in pSv/h from one Curie source ?
> Please advise.
> Thanks and regards,
> Raksha.
>
> ----- Original Message -----
> From: answers_at_pcfluka.mi.infn.it
> To: "Raksha Rajput" <rakshak_at_britatom.gov.in>
> Cc: fluka-discuss_at_fluka.org
> Sent: Friday, April 10, 2020 9:12:21 PM
> Subject: Re: [fluka-discuss]: Dose rate at a point from Multiple sources
>
> Hello
> In order to score DOSE-EQ you do not need to define specific regions, and
> it is much better to leave air all around your shield.
> The calculation of DOSE-EQ starts from particle fluences, not from
> deposited energy. Particle fluences are convoluted with conversion factors
> that depend on particle type and energy. The standard conversion
> coefficients in fluka transform particle fluences in ambient dose
> equivalent (H*(10)).
> If you have cylindrical symmetry, You can define a cylindrical USERBIN
> around your shield, with one or more inradial intervals and how many
> longitudinal intervals as you need, then pick up the dose values in the
> bin you need. If you do not have cylindrical symmetry, you can use
> r-phi-z binning, or a cartesian binning.
>
> If you ask for DOSE-EQ, do not put water around, it will absorb the
> radiation and change the dose value.
>
> And, do NOT use the AUXSCORE to select photons only: in reality, the
> photons will produce electrons, that are the particles really depositing
> energy. If you need dose you have to consider electrons. So, no AUXSCORE
> card.
>
> If, instead, you really need dose in water, where dose is defined
> as
> deposited energy/ unit mass
> then ask for DOSE in your region-by-region userbin.
> AND do NOT use the AUXSCORE card, otherwise you will miss almost all
> the deposited energy, because it is deposited by secondary electrons.
> Photons do not deposit energy directly, it only happens in the simulation
> because there are transport thresholds: photons below threshold
> stop and their energy is counted as deposited there.
>
> Hope this helps
> Paola
>
> On Thu, 9 Apr 2020, Raksha Rajput wrote:
>
>> Dear Experts,
>>
>> I have a cylindrical source cage, with Co-60 cylindrical source at 25
>> positions, equidistant. I wish to calculate dose at different points on
>> the
>> surface of the lead shielding. How should I calculate the dose rate at a
>> point ? Presently I am scoring USRBIN/DOSE-EQ with AUXSCORE/PHOTON in
>> SPH
>> bodies of 5 cm radius, touching the surface of my shielding flask.
>>
>> Referring to the link below, I got answers to my questions but only for
>> point no.5, please throw some more light, or suggest the specific
>> options in
>> the USRBIN card.
>> https://pcfluka.mi.infn.it/FLUKA/web_archive/earchive/new-fluka-discuss/159
>> 80.html
>>
>> Thanks and regards,
>> Raksha.
>>
>>
>>
>>
>
>
>
> __________________________________________________________________________
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>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Mon Apr 13 2020 - 10:35:50 CEST