Electrostatic radioactive particle collector

The facility includes an electrostatic field source whose outlets are connected to a collector electrode and a repulsive electrode and which is accommodated in an insulating casing in a manner such that the electrodes remain uncovered, partly at least. The electrostatic field source can be a capacitor or a formed electret; alternatively, voltage can be brought from an external source. The detector itself can serve as the collector electrode. The electrostatic collector is placed where the volume concentration of radioactive particles is to be measured. The radioactivity collected can be measured over a chosen period of collection by transferring the collector electrode to the detector, or continuously by collecting the radioactive particles directly onto the detector window or onto a thin electrode covering the window. (M.D.). 2 figs