This International Standard defines technical requirements for equipment for monitoring of alpha-, beta- or gamma-emitting radionuclides in liquid effluents and surface waters, provides some general guidance as to the possible detection capability of such equipment and indicates when and where its uses may be practicable.NOTE Alpha monitoring in liquids is a possibility that has been demonstrated using a concentration device and collection of the concentrate in a filter, so this standard may also be applicable to alpha monitoring in liquids.This standard is applicable to equipment for continuous monitoring of the activity:– in liquid effluents which could b