RE: [fluka-discuss]: Minimium

From: Masoomeh Yarmohammadi Satri <masoomeh.yarmohammadi.satri_at_cern.ch>
Date: Thu, 9 Mar 2017 12:44:44 +0000

Dear Luigi and All, I scored the Dose Equivalent of photon and electron out of the 45keV electron beam exposed the 0.5cm Copper target. True, The plots of error show the number of back-scattered electron are more than photons. The question is here, as the plot of dose equivalents show the Dose EQ (uSv/primary) of Photon is almost E(7) larger that the back scattered electron while I was expecting in the opposite direction (Dose EQ of Electron> Dose EQ of Photon)? I need to Multiply a factor for Dose EQ of Electron or photon or my expectation (Dose EQ of Electron> Dose EQ of Photon) is not correct? The inp file and the plot of error and Dose EQ for scored photon and electron are attached Cheers, Masoomeh ________________________________________ From: Luigi Salvatore Esposito Sent: 02 March 2017 12:04 To: FLUKA discussion Cc: Masoomeh Yarmohammadi Satri Subject: Re: [fluka-discuss]: Minimium For sake of precision, also fluorescence x-rays contribute to the radiation field outside the target. However, after a quick check, the contribution is really tiny w.r.t. electrons. Best, luigi > On 1 Mar 2017, at 11:08, Luigi Salvatore Esposito <luigi.salvatore.esposito_at_cern.ch> wrote: > > Dear Masoomeh, > the only contribution to the dose around the target is to due the electrons that are back-scattered: > 45 keV electrons are surely stopped by 0.5 cm thick copper target. > This does not depend on MULSOPT card. > Best regards, luigi > >> On 28 Feb 2017, at 15:51, Masoomeh Yarmohammadi Satri <masoomeh.yarmohammadi.satri_at_cern.ch> wrote: >> >> Dear Francesco and all the expertise, >> >> Thanks for your replies. >> >> I ran the simulation with 50 cores to improve the statistics. I set the 1keV as the threshold foe almost all the area (Target and void). >> >> I see zero erro and Zero dose Equivalent on the other side of the target (opposite side of source) ?!? If switching to single scattering (MULSOPT card) causes this Zeros? The plots and inp files are attached >> >> >> Best regards, >> Masoomeh >> >> ________________________________________ >> From: Francesco Cerutti >> Sent: 23 February 2017 13:46 >> To: Masoomeh Yarmohammadi Satri >> Cc: Giorgi Kharashvili; FLUKA Discussion List >> Subject: RE: [fluka-discuss]: Minimium >> >> in EMFCUT you have to specify the regions where the threshold applies, >> i.e. TARGET as WHAT(4) in your case >> >> If you look into the output file (NewDesignV5-1001.out), you will see >> that your 1 keV threshold has not been taken due to the wrong command >> >> F >> >> ************************************************** >> Francesco Cerutti >> CERN-EN/STI >> CH-1211 Geneva 23 >> Switzerland >> tel. ++41 22 7678962 >> fax ++41 22 7668854 >> >> On Thu, 23 Feb 2017, Masoomeh Yarmohammadi Satri wrote: >> >>> Dear Fracesco and Giorgi, >>> >>> Many thanks for the emails. I reduced the transport threshold to 1keV for all the regions (Global) and added the MULSOPT card for switching the single scattering . Unfortunately, it gives no result and the files are empty to plot. >>> >>> The inp file is been attached to the email >>> >>> >>> Best regards, >>> Masoomeh >>> ________________________________________ >>> From: Francesco Cerutti >>> Sent: 22 February 2017 12:52 >>> To: Masoomeh Yarmohammadi Satri >>> Cc: Giorgi Kharashvili; FLUKA Discussion List >>> Subject: RE: [fluka-discuss]: Minimium >>> >>> And switch on single scattering with MULSOPT >>> >>> ************************************************** >>> Francesco Cerutti >>> CERN-EN/STI >>> CH-1211 Geneva 23 >>> Switzerland >>> tel. ++41 22 7678962 >>> fax ++41 22 7668854 >>> >>> On Wed, 22 Feb 2017, Francesco Cerutti wrote: >>> >>>> >>>> Hi Masoomeh, >>>> >>>> yes, there is a fundamental problem in your input file. >>>> You cannot run 45 keV electrons with a transport threshold set by default at >>>> 100 keV (as printed in the output file). >>>> Lower it down to the 1 keV hard limit mentioned by George through the EMFCUT >>>> card >>>> >>>> Cheers >>>> >>>> Francesco >>>> >>>> ************************************************** >>>> Francesco Cerutti >>>> CERN-EN/STI >>>> CH-1211 Geneva 23 >>>> Switzerland >>>> tel. ++41 22 7678962 >>>> fax ++41 22 7668854 >>>> >>>> On Wed, 22 Feb 2017, Masoomeh Yarmohammadi Satri wrote: >>>> >>>>> Dear George, >>>>> >>>>> Many thanks for your email. >>>>> >>>>> I tried for 45keV electron on a Cu target. I receive no data. If there is >>>>> a problem in the file? >>>>> >>>>> Or it is the matter of low energy, Cu target and Fluka with this energy? >>>>> If Yes, If you propose other simulation code for this energy and target? >>>>> >>>>> Regards, >>>>> Masoomeh >>>>> ________________________________________ >>>>> From: George Kharashvili [georgek_at_jlab.org] >>>>> Sent: 20 February 2017 15:53 >>>>> To: Masoomeh Yarmohammadi Satri >>>>> Cc: FLUKA Discussion List >>>>> Subject: Re: [fluka-discuss]: Minimium >>>>> >>>>> Dear Masoomeh, >>>>> >>>>> The low limit of electron transport is 1 keV. However, modeling of 45 keV >>>>> electron beam interaction with matter requires special care. From FLUKA >>>>> manual Chapter 1.1.7: "The minimum recommended energy for PRIMARY >>>>> electrons is about 50 to 100 keV for low-Z materials and 100-200 keV for >>>>> heavy materials, unless the single scattering algorithm is used." >>>>> >>>>> Best regards, >>>>> George >>>>> >>>>> >>>>> >>>>> ----- Original Message ----- >>>>> From: "Masoomeh Yarmohammadi Satri" <masoomeh.yarmohammadi.satri_at_cern.ch> >>>>> To: "FLUKA Discussion List" <fluka-discuss_at_fluka.org> >>>>> Sent: Monday, February 20, 2017 8:38:53 AM >>>>> Subject: [fluka-discuss]: Minimium >>>>> >>>>> Dear All, >>>>> >>>>> If there is a minimum level of energy for defining as beam energy in >>>>> Fluka. If Fluka is useful for 45keV electron beam energy hitting a target? >>>>> >>>>> >>>>> Best regards, >>>>> Masoomeh >>>> >>>> >>> >> <NewDesignV5-1.inp><45kEv-electron.png><Dose EQ-45keV electron beam.png> > > __________________________________________________________________________ > You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id?c_info >


__________________________________________________________________________
You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info

Received on Thu Mar 09 2017 - 15:03:08 CET