Abstract: A radiation detector useful for well logging and other applications contains a stabilizing pulsar device comprising a scintillator coupled to a photodetector and including a radio-active source such as an Am.sup.241 which simultaneously emits gamma rays and low energy particles such as .alpha. or .beta. particles upon decay. The pulsar device is coupled to the radiation detector which utilizes a scintillation crystal and photodetector, and the outputs from the two photodetectors are processed through a coincident/anti-coincident gate alternately to stabilize the gamma rays or to read the environmentally induced radiation.

Abstract: Scintillators, and more particularly inorganic scintillation crystals such as cadmium tungstate, bismuth germanate, barium fluoride and calcium fluoride are coated with one or more coatings of a highly reflective material such as barium sulfate dispersed in a suitable binder such as sodium silicate to provide a highly reflective surface layer capable of providing internal reflection of scintillation events in the region of 200-700 nm. The reflective surface enhances the pulse height and resolution of the scintillator when coupled to a suitable detector such as a photomultiplier tube or a silicon photodiode.