Abstract: A germanium semiconductor radiation detector contact made of yttrium metal. A thin (˜1000 ?) deposited layer of yttrium metal forms a thin hole-barrier and/or electron-barrier contact on both p- and n-type germanium semiconductor radiation detectors. Yttrium contacts provide a sufficiently high hole barrier to prevent measurable contact leakage current below ˜120 K. The yttrium contacts can be conveniently segmented into multiple electrically independent electrodes having inter-electrode resistances greater than 10 G?. Germanium semiconductor radiation detector diodes fabricated with yttrium contacts provide good gamma-ray spectroscopy data.

Abstract: A germanium semiconductor radiation detector contact made of yttrium metal. A thin (˜1000 ?) deposited layer of yttrium metal forms a thin hole-barrier and/or electron-barrier contact on both p- and n-type germanium semiconductor radiation detectors. Yttrium contacts provide a sufficiently high hole barrier to prevent measurable contact leakage current below ˜120 K. The yttrium contacts can be conveniently segmented into multiple electrically independent electrodes having inter-electrode resistances greater than 10 G?. Germanium semiconductor radiation detector diodes fabricated with yttrium contacts provide good gamma-ray spectroscopy data.

Abstract: The spark ignition distributor cap assembly includes a distributor cap and a base with coupling means for removably securing the cap to the base during use of the ignition cap assembly. Sealing means is operatively associated with the cap and the base to provide a barrier therebetween so as to prevent liquid such as road water splash, or the like, from entering the interior of the cap and stalling the motor vehicle. Detecting means is operatively associated with the cap for indicating by visual means the moisture condition of the air within the cap. The detecting means comprises a chemical compound that changes its color when hydrated or percipitated, and housing means is mounted on the cap for receiving the detecting means therein.