Abstract: A film stretcher utilizes a spring bias to clamp the film. The film stretcher may include a stretch head having one or more clamps positioned about the film in locations necessary to clamp the film for stretching in one or more axes. The clamp may utilize a spring to provide the clamping force. The stretch head may include structures that operate to counter the spring bias to move the clamp to one state and then to allow the spring bias to move the clamp to another state. Thus, the stretch head may effectively clamp and unclamp the film.

Abstract: A criticality safe vacuum apparatus for removal of particulates from a gas having radioactive particles entrained therein. The apparatus includes a first staged segment including a cyclone housing and a second staged segment including a first filtration media for removal of particulates from gas. The cyclone housing is configured to accept insertion of a gas collection end of the second staged segment, and includes an intake port and an elongated length extended to a particulate collection container. Within the cyclone housing, cyclonic flow separates particulates from gas, with the gas moved by vacuum pressure into the first filtration media concurrently with particulates settling into the collection container. A third staged segment of a second air filtration media is positioned upgradient of the first filtration media.