Patent ID: 9625591
Date: 2017-04-18
CPC Classifications: G01F,G01N,G01T

Claim:
1. A level gauge or density profiler comprising at least one source of ionising radiation and a detector probe for detecting the ionising radiation, the detector probe comprising: at least 10 radiation detectors adapted for detecting ionising radiation comprising alpha particles, beta particles, gamma radiation and/or neutrons, the radiation detectors being supported along an elongate support, wherein an electrically operated self-regulating distributed heat source is arranged along the elongate support in proximity to the detectors so that the temperature of the detectors may be changed by operation of the distributed heat source, the heat source being an electrical device incorporating a conducting material having a resistance which is variable according to a temperature of the heat source, and the radiation detectors, support and distributed heat source are enclosed within a dip pipe and there is thermal insulation between an inner wall of the dip pipe and the detectors.