A radiation detector (Figure 1) is formed from a plasma panel (element 10) that includes a front substrate (12), and a back substrate (14 that forms a generally parallel gap (18) with the front substrate (element 12). X (column)(16) and Y (row) (17) electrodes are coupled by gas discharge events to define one or more pixels. Impedances are coupled to the X (16) and Y (17) electrodes, and a power supply is coupled to one or both types of electrodes. Discharge event detectors are coupled to the impedances.