The role of gamma-ray level detection systems in chemical plant instrumentation

There is a wide diversity of requirements for fluid level gauges in chemical manufacturing processes. Gamma-ray instruments have the outstanding feature that they can operate entirely from outside the vessel. While they are admirably suited to on/off control at a fixed level or continuous indication over a short range, installations become expensive and cumbersome for continuous vertical ranges greater than about 3 ft. Radiation safety aspects are discussed and a typical installation for a glass melting furnace is described.