Abstract: A system and method for detecting radiological sources with improved accuracy. The system comprises at least a first radiological sensor, at least a first three-dimensional (3-D) sensor and processing logic. The first radiological sensor detects radiation emitted by a radiological source and outputs a radiation count rate. The 3-D sensor detects distance of a moving carrier of the radiological source from the radiological sensor and outputs a 3-D sense signal containing first distance domain information. The processing logic is configured to perform a data-fusion algorithm that converts the radiation count rate into second distance domain information and combines the second distance domain information with the first distance domain information to obtain fused data. The datafusion algorithm compares the fused data with a threshold value to determine whether the detected radiation is a true positive or corresponds to background radiation.