Abstract: The apparatus for checking persons for radioactive contamination comprises two detector panels (1, 2), each of which is provided on one broadside with detectors. The two detector panels (1, 2) extend at an angle to each other and said angle has an apex which defines a vertical axis. Those broadsides of the detector panels which are provided with detectors face the space included by the detector panels. Adjacent detectors of each detector panel are separated from each other by a vertical blank strip, which is so arranged relative to the contour of a reference figure (6) in a top plan view that the signals generated by the detector means which are separated by the blank strip (9, 10) can be processed to compensate the influence of the closest approximation of the reference figure to the detector panel on the generation of said signals. Adjacent detector means on each side of the vertical blank strip may be separated by a horizontal blank strip. The apparatus may be provided with underarm boxes.