<html><head><style>p{margin-top:0px;margin-bottom:0px;}</style></head><body><div style="font-size:10pt; font-family:Gulim;">Dear SeungEun Lee I have an experience in the simulation of Cerenkov photons with GATEv6.2 for optical imaging application. The number of Cerenkov photons with different positron energies could be simulated successfully (See the attached files slide#39-47) <div> </div>Here is the optical physics processes that I used for the Cerenkov imaging simulation. # =========================================# optical physics# ========================================= # Scintillation#/gate/physics/addProcess Scintillation# Cerenkov (2016.11.24.KangHG)/gate/physics/addProcess Cerenkov # optical process /gate/physics/addProcess OpticalAbsorption/gate/physics/addProcess OpticalRayleigh/gate/physics/addProcess OpticalBoundary/gate/physics/addProcess OpticalMie/gate/physics/addProcess OpticalWLS /gate/physics/processList Enabled/gate/physics/processList Initialized In my opinion, the kinetic energy of a photo-electron produced by a 511 keV gamma photon should be larger than 280 keV. This is because, the Cerenkov light yield is heavily dependent on the positron(or electron) energy (slide#46-47). Could you let me know the version of GATE and Geant4? I would like to know the optical simulation parameters contained in Materials.xml.-Refractive index of BGO material (RINDEX)-Absorption length of the BGO(ABSLength) Also I would like to know the quantum efficiency of your detector as a function of optical photon energy which is contained in Surfaces.xml.As you know the number of Cerenkov photons is inversely proportional to the wavelength.(slide#43) What type of scanner do you use? (ex> scanner, OpticalSystem) Hopefully, my optical simulation results could help your Cerenkov simulation. Best regards, Han Gyu Kang, PhD student Eulji University, South Korea. <div> </div><div> </div> -----Original Message----- From: <gate-users-request@lists.opengatecollaboration.org> To: <gate-users@lists.opengatecollaboration.org>; Cc: Sent: 2017-01-19 (목) 20:00:01 Subject: Gate-users Digest, Vol 128, Issue 14 Send Gate-users mailing list submissions to gate-users@lists.opengatecollaboration.org To subscribe or unsubscribe via the World Wide Web, visit <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a> or, via email, send a message with subject or body 'help' to gate-users-request@lists.opengatecollaboration.org You can reach the person managing the list at gate-users-owner@lists.opengatecollaboration.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Gate-users digest..." Today's Topics: 1. Cerenkov simulation (SeungEun Lee) ---------------------------------------------------------------------- Message: 1 Date: Thu, 19 Jan 2017 11:25:07 +0900 From: SeungEun Lee <seungeun058@gmail.com> To: gate-users@lists.opengatecollaboration.org Subject: [Gate-users] Cerenkov simulation Message-ID: <CAG3MY96eJBo7uMEtJxkBi8q9tRCwnYo41moUdHB1D4QcmwX9gA@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Dear Gate users, I'm looking forward to observe Cerenkov effects in BGO crystal with 511 keV gamma ray irradiated. I added Cerenkov to the physics list. ### /gate/physics/addProcess Cerenkov ### However, the most important thing is, that there are too small number of Cerenkov events (3 per 100Mevents). It is known that more than 10 Cerenkov photon photon emitted per 511 keV gamma ray and also it is shown in many GEANT4 works previously. Also I wanted to see the Cerenkov photons' origins of generation. I mean which ID and which physical process (photoelectric or Compton) generated this Cerenkov photon. But there are only 'Cerenkov' events written in Hits file. ID of generation is just said to be electron. Did anyone simulate Cerenkov effects in GATE successfully? Is there any tip to solve this? Thanks a lot. Seungeun Lee. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20170119/258e1d17/attachment-0001.html> ------------------------------ Subject: Digest Footer _______________________________________________ Gate-users mailing list Gate-users@lists.opengatecollaboration.org http://lists.opengatecollaboration.org/mailman/listinfo/gate-users ------------------------------ End of Gate-users Digest, Vol 128, Issue 14 ******************************************* </div></body></html> <table style="display:none"><tr><td><img src="https://mail.naver.com/readReceipt/notify/?img=freC1zkrWrmYaXIn%2B6%2B5K6u%2FKxI0FrUwMxUlpxEqaxgdMxCCK6JopxkSK6t9MEIo%2BrkSKAU5W4d5W4C5bX0q%2BzkR74FTWx%2FsprJdpL99brkZbdIn1BFdbZlTbzk5prJdp6FTWzwCM4eZMB3GWr%2F5WXiN.gif" border="0"></td></tr></table>