Abstract: A radioactive particle counter for a plurality of discrete radioactive particle emitting samples, including a plurality of detectors for each sample to simultaneously detect the respective emitted radioactive particles and provide a respective electrical signal, a plurality of storage counters for simultaneously accumulating the respective sample count during a predetermined counting interval, and a read-out control unit for periodically, sequentially reading out the accumulated sample count in each storage counter and coupling same to a control counter for temporary display of the accumulated sample count or for eventually totalling of the respective sample count.