A radiation detector device can include a photosensor and a scintillation device coupled to the photosensor. The scintillation device can include a scintillator crystal enclosed within a casing. The scintillator crystal can be optically coupled to a window at an end of the casing. The scintillation device can include a dielectric gas inside at least part of the casing. The dielectric gas can be adapted to reduce or prevent static discharge within the scintillation device.