RADIOMETRIC METHOD AND MEANS

摘要

There is described a method of and apparatus for measuring radioactive emissions from moving radio-active material. Use is made of at least one radiation detector, a housing serving as a first radiation shield of a first material which shields the detector, and a second radiation shield which is located between at least a portion of the first shield and the detector. The material of the second shield is inherently less contaminated and emits secondary excitation radiation of lower energy than the first material. At least one groove is formed in the housing material to expose at least a portion of a receptor surface of the detector. The groove extends transverse to the direction of movement of the material over the detector.