Beta Particle Detection Using a Gas Electron Mutiplier

My current research focuses on beta particle detection by electron amplification using a Gas Electron Multiplier (GEM). This study revolves around the GEM detector itself, and how its geometry affects gain. In my research, this includes utilizing both a two and three layer detector. By using beta decay as a source, I can create a avalanche effect in the detector which proceeds to create a signal. The argument remains wether an extra gem foil layer and detector is a key factor in results.