Method and device for measuring the distribution of radioactivity on a

Abstract

A method and device for effecting a location-sensitive measurement of a flat sample of radiation emitting material having a plurality of partial areas, in which a screen plate having radiation passage openings is disposed between a detector and the sample; radiation emanating from a group of the partial areas is detected in accordance with the shape of the screen plate openings; information based on the detected radiation is stored; and then a relative displacement is effected between the sample and the detector and detecting and storing are repeated for another group of partial areas, so that the total measurement is composed of a plurality of such successively performed partial measurements which provide a measurement of the total distribution of radiation emitted by the sample. The screen plate is provided with a plurality of slits which constitute the passage openings and which extend in parallel with one another essentially across the entire width of the screen plate; each detecting operation involves a substantially simultaneous, location-sensitive measurement of strip-like partial areas of the sample which are in line with the slits; and said each relative displacement is effected between a detection operations exclusively in a direction transverse to the direction in which the slits extend.