Harshaw/filtrol Partnership

Harshaw/filtrol

Oley D Wimer

Bradley K Utts

Frank M Sparacia

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.

Pulser stabilized radiation detector

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.

Scintillator crystal having a highly reflective surface

A light-reflective, flowable and curable composition is described which comprises a resin containing light-reflective solid particles in an amount and of average particle size sufficient to provide the desired light reflectance/transmittance characteristics to the cured composition. Preferably, the composition is self-leveling, and the solid particles may be particles of magnesium oxide, barium sulfate, aluminum oxide or mixtures thereof. The compositions of the invention are useful as reflective coatings in various applications such as for radiation detector devices including scintillator crystals.

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Hudson, OH, United States of America

Oley D Wimer