Re: [fluka-discuss]: normalization with SFLOOR

From: Mikhail Polkovnikov <pmk_at_ihep.ru>
Date: Tue, 2 Aug 2016 12:45:19 +0300

On 27.07.2016 03:51, Roman Savinov wrote:
>
> Dear Mikhail,
>
>
> actually, the right empirical SFLOOD factor which is independent of
> both detector's and source's radiuses as well as the type of source is
>
> As*( 1/(5*Rd)) ^2,
>
> where Rd - radius of detector. I varied all three variants and this
> factor remains valid for all three of them. It agrees with your
> explanation except I don't have 4 in my conversion.
>
> My concern, however, is whether my USRBIN conversion (last line in
> the attachment) is right when SFLOOD is used. I can't find a right
> paper to validate my results.
>
>
> Thank you,
>
>
> Roman
>
>
> ------------------------------------------------------------------------
> *From:* Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru>
> *Sent:* Tuesday, July 26, 2016 10:57:45 AM
> *To:* Roman Savinov; fluka-discuss_at_fluka.org
> *Subject:* Re: [fluka-discuss]: normalization with SFLOOR
> On 22.07.2016 03:23, Roman Savinov wrote:
>>
>> Dear Mikhail,
>>
>>
>> you are right, I am not getting a correct integral fluence if I use
>> solely the normalization factor found by integrating the differential
>> fluence. However, I found empirically that if I multiply this factor
>> by 4*pi*(Rs/100)^2, where Rs is radius of emission sphere, it works!
>> Even with different radiuses and SPE sources. Clearly this is somehow
>> related to the 1/(pi R^2) cm-2 you mentioned earlier but I can't
>> figure out how.
>>
>> If you can determine the relationship, it would be very helpful. In
>> any case, thank you for your help,
>>
>>
>> Roman
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>> *From:* Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru>
>> *Sent:* Thursday, July 21, 2016 1:00 AM
>> *To:* Roman Savinov; fluka-discuss_at_fluka.org
>> *Subject:* Re: [fluka-discuss]: normalization with SFLOOR
>> On 21.07.2016 01:52, Roman Savinov wrote:
>>> Dear Mikhail,
>>>
>>> thank you for your response.
>>> I tried SFLOOD after following the Alfredo's suggestion
>>> http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0875.html
>>> What I need is indeed uniform and isotropic source of fluence
>>> however not of a fixed value but with energy spectra defined
>>> by file. I need this to simulate a particular solar event.
>>> Is SFLOOD a right thing to do it? Can it be used with a spectra file
>>> or it always produces fluence of a fixed value?
>>> I attach the source file with differential fluence of the 1956
>>> event to show what I mean. The units are: [ MeV #/cm2/MeV ]
>>>
>>> Thank you,
>>>
>>> Roman
>>>
>>>
>> Dear Roman,
>>
>>
>>
>> Your source_sfloor.f file was correct. SFLOOD is just an uniform and
>> isotropic fluence (density of the tracks) within the sphere, the
>> energy of each particle is generated according to your spectrum
>> (first column - energy bin (MeV), second column - diff. fluence).
>>
>>
>> I can't guarantee, that you will get a correct integral fluence for
>> normalization, just by integrating the differential fluence data from
>> given spectrum.
>>
>>
>> Best regards,
>>
>> Mikhail
>>
>
> Dear Roman,
>
>
> If i understood correctly,
>
>
> For example you have an integral fluence N [particles/cm^2]. When you
> multiply this value by 4*pi*(Rs)^2 you will get a total number of
> particles, emitted by a SFLOOD sphere. The fluence inside the sphere
> will be 4*N [particles/cm^2]. In your case 4*N/100^2.
>
>
> Best regards,
>
> MIkhail
>

Dear Roman,


Sorry for so late response.


When you use USRBIN with region-scoring, the result isn't normalized per
region volume.

For DOSE scoring your result will be [GeV/g per primary]. Then you
multiply the result by number of primaries, emitted by SFLOOD sphere,
and covert GeV/g to Gy to obtain a total dose within the scoring region.



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Received on Tue Aug 02 2016 - 13:46:03 CEST

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