Abstract: A device for taking air gap backscatter radiation measurements at a pair of predetermined distances from the surface of a material is disclosed. The ratio of the first and second measurements are a function of the density of the material when one of the distances is sufficiently large that the measurement is dependent on the chemical content of the material but is independent of surface irregularities and density and when the second distance is greater than the average surface irregularity but sufficiently proximate to the material so that the measurement is independent of surface irregularities but is dependent on the density and the chemical content of the material. The device includes a housing slidably supported between a pair of end plates, a carrying handle for the device and a source within the housing. When the handle is in a first position, the source is disposed in a storage or "safe" position.

Abstract: A slide mount for removably supporting a citizen'band (CB) radio or similar electronic equipment in a vehicle, or the like, or any other mounting surface, including a base attached to the vehicle and a slide attached to the CB radio and a quick disconnect structure for mechanically engaging the slide with the base and releasably latching the slide in position and also providing quick disconnect pin and socket-type connections between antenna circuits and electrical circuits so that the CB radio may be easily installed and removed with the installation and removal automatically coupling all of the components to the radio so that it may be operated immediately upon completion of the slide connection.