I am designing an experiment where I need to trigger the release of an electron by a radioactive source (Sr-90).
The easy way to do it is to use a thin scintillator right after the source collimator. The problem is that it would interfere with the electron particle causing multiple scattering.
Do you know a better way to detect the presence of a single relativistic (E=200 KeV gamma=0.38) electron without interfering with it?
We are building a small chamber to measure the drift properties of electrons in various gas mixes. The chamber is similar to that described in (http://www.sciencedirect.com/science/article/pii/S0168900298013886). I would like use the setup to measure the primary ionization yield of an electron in a mixture. The idea is to place a collimated Sr90 source in the gas volume, near the first plate. The beta electron travel at c toward the drift tube ionizing the gas. The electric field drift the ionized electrons toward the drift tube were they are collected and counted. The trigger is provided by a scintillator near the exit point of the electron from the camera (after the drift tube) in coincidence with the tube. Tube drift tube is somewhat noisy so I would like to have another trigger signal, preferably near the source collimator.