[fluka-discuss]: Scoring energy spectrum Cs-137 in LaBr3

From: Francesca Ferrulli <francesca.ferrulli_at_mail.polimi.it>
Date: Tue, 1 Mar 2022 11:55:04 +0000

Dear FLUKA experts,


I simulated a LaBr3 crystal and I want to score the energy spectrum of a Cs-137 source and compare it with the result I got experimentally. I simulated the source using the ISOTOPE option and HI-PROPE card as a cylindrical source in a plastic encapsulation (as in the linked post). The LaBr3 is covered by an aluminum layer and it has a window since it is hygroscopic. I do not know the exact design of the scintillator, but I also assumed it’s SiO2 the window and 3 mm thick.


I scored the number of events inside the LaBr with the card DETECT and applied a GEB assuming FWHM = a +b*(E+cE^2)^(1/2) where a,b,c were obtained from the experimental spectra.


I set both the transport and production energy threshold of electrons and photons to 10 keV which is the threshold of my detector.


I attach the simulation results (after the GEB) and experimental results. The photoelectric peak and the Compton edge are well reproduced, differences in the backscattered peak are expected since the actual crystal is enclosed in case which I did not simulate. However I do not understand the peak at about 65 keV. I see from the previous post that the same peak was detected (is it at the same energy or am I wrong?).

I also attach my input file.


Best regards,

Francesca





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

LaBr_Cs-spectra.png
(image/png attachment: LaBr_Cs-spectra.png)

Received on Tue Mar 01 2022 - 14:37:57 CET

This archive was generated by hypermail 2.3.0 : Tue Mar 01 2022 - 14:38:20 CET