Johnson Matthey Inc.

Magne Kjetil Husebo

Tor Magnus Saevareide

The invention provides an apparatus and method for measuring a property of a gas, such as the amount of liquid in a stream of the gas. The apparatus comprises a source of beta particles (), a detector () capable of detecting beta particles, means () to support said source and said detector spaced apart from each other such that gas may enter the space between the source and detector and that the source is positioned to emit beta particles towards said detector; wherein said detector comprises a scintillation material in optical communication with a photodetector (), and means () to physically isolate said photodetector from said gas.

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Tertnes, Norway

Magne Kjetil Husebo