<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"> <html><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'> Dear Gate-users, I want to use optical photons to track the particles path in the crystals. As mentioned in manual, I set the GATE_USE_OPTICAL to ON and to decrease the simulation time I reduce the number of crystals (I have only 5 blocks of LSO crystals each block contains 64 crystals). I don't have niether singles nor coincidences in my root file. I am using version 7.2. I took 4 slices (slice duration = 1s ). Any ideas about this issue will be highly appreciated. My code is as follows: #=============================== # P H Y S I C S #=============================== /gate/physics/addPhysicsList QGSP_BERT_EMV /gate/physics/addPhysicsList emstandard /gate/physics/addProcess PhotoElectric gamma /gate/physics/processes/PhotoElectric/setModel StandardModel /gate/physics/addProcess Compton gamma /gate/physics/processes/Compton/setModel StandardModel /gate/physics/addProcess OpticalAbsorption #============================== # S O U R C E #============================== /gate/source/addSource betta /gate/source/betta/gps/particle opticalphoton /gate/source/betta/gps/polarization 1 0 0 /gate/source/betta/gps/energytype Fluor18 /gate/source/betta/setForcedUnstableFlag true /gate/source/betta/setForcedHalfLife 6586 s /gate/source/betta/gps/energytype Mono /gate/source/betta/gps/monoenergy 511 keV /gate/source/betta/gps/type Volume /gate/source/betta/gps/shape Sphere /gate/source/betta/gps/radius 0.1 mm /gate/source/betta/gps/centre 0. 0. 0. cm /gate/source/betta/gps/angtype iso /gate/source/betta/setActivity 500 kilobecquerel #===================================================== # D I G I T I Z E R: DETECTOR ELECTRONIC RESPONSE #===================================================== /gate/digitizer/Singles/insert opticaladder /gate/digitizer/Singles/insert readout #===================================================== # C O I N C I D E N C E S O R T E R #===================================================== /gate/digitizer/Coincidences/setInputName Singles /gate/digitizer/Coincidences/setOffset 0. ns /gate/digitizer/Coincidences/setWindow 6 ns /gate/digitizer/Coincidences/MultiplesPolicy killAll #===================================================== # D A T A O U T P U T #===================================================== /gate/output/root/enable /gate/output/root/setFileName optic2_l12_polorizedsource /gate/output/root/setRootOpticalFlag 1 /gate/output/root/setRootHitFlag 1 /gate/output/root/setRootSinglesFlag 1 /gate/output/fastanalysis/enable <div> </div> </body></html>