for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water

Full Title

Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation (G01T3/00, G01T5/00 take precedence) > Measuring radiation intensity (G01T1/29 takes precedence ) > Circuit arrangements not adapted to a particular type of detector > for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water