Device for estimating a direction pointing toward an irradiating source

A device for estimating a direction pointing toward a radioactive source, the radioactive source emitting radiation composed of gamma particles or X-rays or neutrons, the device comprising:

• a holder;
• and
• at least two radiation detectors, each detector being configured to generate a detection signal, depending on a number of particles detected by the detector, wherein each detector is assigned a position, the detectors being placed around a center corresponding to an iso-centroid of each position, a centroid of each position being equally weighted, the device further comprising processing circuitry configured to
• compute a centroid of each position weighted by the detection signal measured by the detector occupying said position;
• depending on the centroid, estimate a direction pointing toward the radioactive source, corresponding to a direction between the device and the radioactive source;
• store the detection signals of the detectors at a first time;
• store the detection signals of the detectors at a second time, after the first time;
• take into account a position of each detector at the first time and at the second time;
• and
• compute the centroid of the respective positions of the detectors at each time, weighted by the detection signals measured by each detector at each time, respectively.