This standard BS IEC 60692:1999 Nuclear instrumentation. Density gauges utilizing ionizing radiation. Definitions and test methods is classified in these ICS categories:
17.240 Radiation measurements
17.060 Measurement of volume, mass, density, viscosity
Lays down definitions, test methods and procedures for density gauges utilizing ionizing radiation designed for measuring the density of liquids, gas vapours, slurries or fluidized solids. The output signals from density gauges may be either analogue or digital.