Radiation detector probe with heat source for level measurement and density profiler apparatus

摘要

A detector probe 10 for detecting ionising radiation comprising at least one radiation detector, such as Geiger Muller (GM) tubes 14, is mounted on a support, such as printed circuit board 12. An electrically operated source of heat, such as a trace heating cable (18, fig. 2), is arranged on the support in proximity to the detector so that the temperature of the detector may be changed by operation of the heat source. The detector probe may be used in a level gauge or density profiler for measuring a level of two or more material phases.