Abstract
Three new types of instruments for the detection and monitoring of small concentrations of gas in air are described. The Nair system employs narrow band infrared absorption. The ionic-amperometric detector is applicable to oxidizing and reducing gases. The clathrate detector utilizes die release of entrapped radioactive krypton from a crystal lattice as a measure of a contaminant in air. These techniques should be adaptable to other industrial hygiene problems as well as to missile propellants.