Scintillation crystal modules and methods of making the same

Details Scintillation crystal modules and methods of making the same Scintillation crystal modules and methods of making the same

G - Physics

01

T

G01T 1/202 (2006.01) G01T 1/164 (2006.01) G01T 1/20 (2006.01)

Patent

CA 2209580

The invention provides a scintillation crystal module having an epoxy seal which has a coefficient of thermal expansion which is substantially the same as the backcap of the gamma camera. Among the suitable epoxy systems, the CTE of the epoxy could be modified somewhat by choosing a different catalyst or by adjusting the resin:catalyst ratio. The presently preferred epoxy system is a STYCAST R 2850 FT system available from W.R. Grace & Co. Using "catalyst 9" or "catalyst 11" from that system, a CTE of approximately 17.33x10-6 to approximately 19.4x10-6 in/in°F can be easilyachieved. It has been discovered through analysis using FEA that an epoxy with a CTE in the range of 9.0 to 20.0x10-6 in/in°F provides satisfactoryresults in preventing seal separation during +40°F temperature cycles. A method of making a scintillation crystal module according to the invention includes the preparation of an epoxy seal having a coefficient of thermal expansion which is substantially the same as the backcap of the module, and assembling the seal, backcap, glass, and crystal in a conventional manner.

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