Radioactivity positioning detection method and security check door

The invention discloses a radioactivity positioning detection method and a security check door, the security check door comprises two columns and a cross beam, a plurality of detectors for radioactive substance detection are uniformly arranged on the cross beam and at least one column at intervals, the scintillator surface of the detector on the cross beam faces downwards, and the scintillator surface of the detector on the column faces the other column; the outputs of all the detectors are connected with a processing unit, and the processing unit determines the detector with the strongest signal intensity on the cross beam and the detector with the strongest signal intensity on the stand column according to the detection signals of all the detectors on the cross beam and the detection signals of all the detectors on the stand column. And determining the intersection point of the corresponding directions of the two detectors with the strongest signal intensity or the vicinity of the intersection point as the