Well-type scintillation assembly

In a well-type scintillation assembly utilizing an inorganic crystal with an optically visible front face, the improvement comprising

• a. The use of an optical filter in contact with the crystal in regions of high light intensity and capable of absorbing from about 10 to about 90% of the light emitted in these regions, and
• b. The use of a cellulosic-type layer of highly reflective material contacting the crystal in regions of low light intensity,
• for the purpose of improving the uniformity of light flashes reaching the front face of the crystal.

In the method of assembling a well-type scintillation assembly including a generally cylindrical inorganic scintillation crystal having a front face, a back face and a cylindrical well extending from the back face toward said front face, but terminating short thereof, and a housing conforming to and enclosing said crystal except for the front face thereof, said method including

• a. placing an optical filter in contact with said crystal at the bottom of said well, said filter capable of uniformly absorbing between 10 and 90% of the scintillation events occurring in the crystal in proximity of the filter,
• b. placing a sleeve of a cellulosic-type reflective material in contact with said crystal around the inside of said well and
• c. placing an annular disc of cellulosic-type reflective material in contact with the back face of said crystal.