Hi,
May I pop-up here, as I have very a close/related question to Raksha
last question!
For the Eq-Dose (and Activity) estimations, assuming irradiation profile
of: beam intensity (PpS), Irradiation time (t_Irr) and cooling/decay
time (t_Col):
- For EQ-DOSE during exposure: I put t_Col = -1, right? And the result
will be in PSv/Primary, right? And to get it to PSv/s I need to divide
by t_Irr and multiply by PpS, right?
- For EQ-DOSE after decay: I put t_Col > 0 [s], right? And the results
will be in PSv/s, right? And to get it in pSv/h I need to multiply by
(3600), right?
- For EQ-Dose prompt: Should I put t_Col = 0? if yes, the results will
be in PSv/primary? if yes, how to convert it to PSv/s? Should I multiply
it by PpS and divide by t-Irr?
Regards,
Tamer
On 08.05.2020 07:58, Raksha Rajput wrote:
> Dear Experts,
>
> Thanks alot for the explanation and the corrections suggested.
>
> About mSv/h: after getting results in pSv/particle, i need to multiply it by (3.7E+10 * 3600) to convert it to pSv/h. And later to mSv/h.
> Hope I am doing it correct.
>
> Regards,
> Raksha R.
>
> ----- Original Message -----
> From: "paola sala" <paola.sala_at_mi.infn.it>
> To: "Raksha Rajput" <rakshak_at_britatom.gov.in>
> Cc: answers_at_pcfluka.mi.infn.it, fluka-discuss_at_fluka.org
> Sent: Thursday, May 7, 2020 6:51:35 PM
> Subject: Re: [fluka-discuss]: Ques on Biasing
>
> Hello
> answres below
>> Dear Experts,
>> Thank you for your time.
>>
>> Please find attached the biasing I have used in the input. As I understood
>> from one of the examples given in the FLUKA Course, giving "BIASING
>> 0.0 1. BLKBODY _at_LASTREG 1.PRINT" means giving importance 1 to
>> regions outside shield.
> It means giving importance 1 to ALL regions, it is a sort of initialization.
> Adding more BIASING cards after this one will change the impostance of the
> various regions.
> However, if you leave the outside air to 1, almost all particles will be
> killed when they go from the shield (high impos=rtance) to the outside air
> (low importance).. thus all the biasing will be lost there. The outside
> air should have the same importance as the last layer of the shield.
>
>> Am I wrong to understand this ? I am sorry, I
>> missed to have added any biasing for green regions (which are SS
>> material).
> Same as before.
>
>> Secondly, by the results are higher by a factor of 1000, I mean to say,
>> the dose rates which I should get in mSv/h, I am getting in Sv/h.
> ? results for DOSE-EQ are in picoSievert/primary for prompt radiation,
> picoSievert/second for specific decay times.
>
>> Thanks and regards,
>> Raksha R.
>>
>>
>> ----- Original Message -----
>> From: answers_at_pcfluka.mi.infn.it
>> To: "Raksha Rajput" <rakshak_at_britatom.gov.in>
>> Cc: fluka-discuss_at_fluka.org
>> Sent: Wednesday, May 6, 2020 8:41:57 PM
>> Subject: Re: [fluka-discuss]: Ques on Biasing
>>
>> Hello
>> The geometry looks fine, I cannot judge on biasing not knowing the factors
>> you used. However: what is the weight assigned to the green regions in
>> your plots? And to outside air?
>> Could you please explain what do you mean by "results a factor 1000
>> higher than expected"?
>> Thanks
>> Paola
>>
>> On Tue, 28 Apr 2020, Raksha Rajput wrote:
>>
>>> Dear Experts
>>>
>>> Please find attached the geometry cross-section.
>>> 1. RCC (A10) is cut by planes to divide it into regions, for Biasing
>>> (surface-splitting, increasing no. of photons per region)
>>> 2. RCC(A14) is also cut by same planes (as these are infinite), to
>>> divide for biasing. Is this the correct way ? OR, it should be done by
>>> making concentric RCCS as is done for RCC(A7). A10 & A14 for Axial
>>> points (Top of the shield).
>>> 3. RCC(A7) is divided into regions by making concentric RCCs - to
>>> calculate the dose rates in radial points.
>>> Kindly suggest whether the regions are divided correctly.
>>> Or, please suggest corrections.
>>> The results I am getting are higher(by a factor of 1000) than expected.
>>>
>>> Thanks in advance.
>>> Regards,
>>> Raksha.
>>>
>>>
>>>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
>
> __________________________________________________________________________
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>
--
Dr. Tamer Tolba
Institut für Experimentalphysik,
Universität Hamburg ,
Luruper Chaussee 149,
22761 Hamburg - Germany
Tel.: +49 (0)40-8998-4872
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Received on Fri May 08 2020 - 14:29:35 CEST