Re: [fluka-discuss]: RE: Fluka run and calculation comparision

From: George Kharashvili <georgek_at_jlab.org>
Date: Thu, 15 Jun 2017 10:56:24 -0400 (EDT)

Dear Masoomeh,

I think you used the photon attenuation coefficient corresponding to 10 MeV photons, but in your problem you are shielding a bremsstrahlung spectrum, not 10 MeV photons. If you do the same exercise for a monoenergetic photon beam, everything should check out.

George

--
George Kharashvili
Jefferson Lab Radiation Control
757-269-6435
----- Original Message -----
From: "Masoomeh Yarmohammadi Satri" <masoomeh.yarmohammadi.satri_at_cern.ch>
To: "Philippe Schoofs" <philippe.schoofs_at_cern.ch>, "FLUKA Discussion List" <fluka-discuss_at_fluka.org>
Cc: "Joachim Vollaire" <joachim.vollaire_at_cern.ch>
Sent: Wednesday, June 14, 2017 7:06:14 AM
Subject: [fluka-discuss]: RE: Fluka run and calculation comparision
Dear Philip,
The relation comes from D2=D1 exp (-ux/p). the relation in the png is written in Mathematics, that "Log" gives the natural logarithm.
Cheers,
MYrmohammadi
________________________________
From: Philippe Schoofs
Sent: 14 June 2017 10:37
To: Masoomeh Yarmohammadi Satri; fluka-discuss_at_fluka.org
Subject: RE: Fluka run and calculation comparision
Dear Masoomeh,
The relation that you show in the png yields x_0 = 44.85 cm, not 103. But maybe I have misunderstood something ?
Cheers
Philippe
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Masoomeh Yarmohammadi Satri
Sent: Tuesday, June 13, 2017 3:06 PM
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Fluka run and calculation comparision
Dear All,
I exposed a two layers: Titanium-copper target with a 10MeV electron beam and read the Dose equivalent data at 1m from the target before a 30cm Concrete wall and after the wall. For a cross check, I used the D2=D1 exp (-ux/p) and implemented the D2 (Dose EQ after the 30cm concrete wall) and D1 (Dose EQ before the wall) from the fluka run data (file is attached as a png). I was expecting the x=30 cm but solving the relation for x gave x=103cm concrete thickness. Could you please let me know why this big difference between the relation and simulation while data of simulation is extracted from 30cm concrete wall thickness?
Best regards,
Masoomeh
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Received on Thu Jun 15 2017 - 18:04:12 CEST