<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Gaters,<div class=""><br class=""></div><div class="">I am simulating the beta isotopes for the absorbed dose and the dose kernels calculations. Generated dose kernels look similar to the published kernels; however, I am not getting the absorbed dose due to the bremsstrahlung process. As bremsstrahlung is dominant at high energies, I am supposed to get the energy straggling tail due to this process. </div><div class=""><br class=""></div><div class="">Followings is the physics model I am using in my code:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/addPhysicsList emstandard_opt3</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/addProcess RayleighScattering</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/processes/RayleighScattering/setModel PenelopeModel</span></div></div></div><div class=""><br class=""></div><div class="">It looks like bremsstrahlung is included in the emstandard_opt3 list. But I have also checked the following combination:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/addPhysicsList emstandard_opt3</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/addProcess RayleighScattering</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class="">/gate/physics/processes/RayleighScattering/setModel PenelopeModel</span></div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures;" class=""><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/physics/addProcess Bremsstrahlung</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/physics/processes/Bremsstrahlung/setModel StandardModel e-</span></div><div style="margin: 0px; line-height: normal;" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/physics/processes/Bremsstrahlung/setModel StandardModel e+</span></div></span></div><div class=""><br class=""></div><div class="">Could anyone help me to understand why I am not getting dose due to bremsstrahlung process? Do I need to modify my physics list to include it in my calculations? </div><div class="">Thank you for your help in advance.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Regards, </div><div class="">Ashok</div><div class=""><br class=""></div></body></html>