<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1452236762616_4985">Hi,</div><div id="yui_3_16_0_1_1452236762616_4951"><br></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4950">In my simulations I have volume source of back-to-back gamma quanta. </div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4986">I would like to ask if this is possible to have some Compton or Rayleigh scatterings in this source? </div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949">If space around source is a vacuum, then source is also treated as a vacuum? Going forward, if space around source is an air, then source is also treated as an air?</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949"><br></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949">My definition of source:</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949"><br></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">#=====================================================</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class=""># linear source</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">#=====================================================</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class=""><br id="yui_3_16_0_1_1452236762616_5074" class=""></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/addSource linear gps</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class=""><br id="yui_3_16_0_1_1452236762616_5078" class=""></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/type Volume</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/shape Cylinder</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/radius 3.2 mm</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/halfz 35. cm</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/pos/centre 0. -45. 0. mm</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class=""><br id="yui_3_16_0_1_1452236762616_5086" class=""></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/setActivity 5000000 Bq</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/setType backtoback</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/particle gamma</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/ene/mono 511. keV</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/linear/gps/angtype iso</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class=""><br id="yui_3_16_0_1_1452236762616_5094" class=""></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949" class="">/gate/source/list</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949"><br></div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949">Best regards,</div><div dir="ltr" id="yui_3_16_0_1_1452236762616_4949">Paweł Kowalski</div></div></body></html>