Abstract: Gamma radiation is detected by placing iron doped glass in an environment bject to gamma radiation and then measuring any color change in the doped glass as a function of gamma radiation.

Abstract: Apparatus and method are described for fabricating a long life cold cathode lectron beam semiconductor device (EBS). Fabrication is given of a vacuum tube structure capable of sustaining sufficiently high vacuum over extended time to prevent poisoning of the cold cathode and steps are give for growth of a plural tip cold cathode structure.

Abstract: Boron nitride is joined to a refractory at high temperatures by coating a rface of the boron nitride with a mixture of paintable consistency of molybdenum disilicide and polyisobutyl methacrylate in an organic solvent, allowing the coated boron nitride surface to air dry, and placing the refractory in contact with the coated boron nitride surface and firing at a temperature above 1500.degree. C. in an inert atmosphere.

Abstract: Metallic coatings are vacuum deposited onto a substrate using more than one eposition method in a single vacuum deposition chamber without breaking vacuum between depositions by providing a vacuum deposition chamber with an RF sputter electrode, a chemical vapor deposition assembly spaced from the sputter electrode, and a substrate that can be rotated from beneath the RF sputter electrode to beneath the chemical vapor deposition assembly, then cleaning and degassing the substrate under vacuum in the deposition chamber, then positioning the substrate below the RF sputter electrode, backfilling the chamber with argon, and then sputter depositing a metal coating onto the substrate and then rotating the coated substrate to beneath the chemical vapor deposition assembly, vacuum pumping the chamber, delivering the material to be chemically vapor deposited to the substrate surface, and heating the substrate to the temperature required for the chemical vapor deposition reaction to take place.