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Most ceramic substrates have excessively high counts of alpha radiation due to naturally occurring contaminants of uranium or thorium in the alumina or glasses.
English (United States)
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Low Alpha Particle Package Design
Most ceramic substrates have excessively high counts of alpha radiation due
to naturally occurring contaminants of uranium or thorium in the alumina or
The design shown is for a multilayer ceramic (MC) -like package which uses
a superstructure laminate of KEVLAR*-Epoxy on a pressed-and- fired blank
alumina base. A relatively thin organic laminate (20 to 30 mils or less), with or
without a buried ground plane, is bonded to an alumina ceramic and then pinned
in the usual manner. The expansivity of the KEVLAR-Epoxy can be selected to
match the alumina almost identically. It has been shown that the KEVLAR-Epoxy
laminate is not a source of a radiation, and that it is thick enough to capture all a
radiation from the alumina substrate. * Trademark of E.I. du Pont de Nemours
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