A research for the relation between the gas scintillation light yield and the gas pressure in the wavelength range from visible to infrared

We investigated light yield of primary scintillation from interactions of alpha particles and gaseous materials under different conditions. The scintillation lights were detected with photomultiplier tubes. The largest yields were obtained under gas pressure of 200 to 300 hPa. We proposed a simple method to deduce photon numbers of primary scintillation.