Abstract: A corona discharge device includes a first electrode assembly comprising a roll formed of conductive material and a second electrode assembly including a conductive member having a ceramic element mounted on the conductive member in arranged generally parallel to the rotational axis of the conductive roll. According to a first embodiment, the second electrode assembly comprises a plurality of electrodes mounted for pivotal movement on one of a pair of support rods arranged in a parallel relation to each other and to the roll. First and second groups of electrodes are disposed on each of the respective rods in a staggered relation to each other.

Abstract: A method for controlling a scintillation camera has a step of, under the control of a CPU, displacing a radiation source displacing device to which is fixed a radiation source and obtaining a center of sensitivity of a photomultiplier tube to be measured. After the center of sensitivity including the effects of the waveform shaping circuit is obtained, the radiation source is displaced in a plurality of directions relative to the center of sensitivity under the control of the CPU, so as to obtain an average photomultiplier tube response (PMT response) as a function of distance from the center of sensitivity of the photomultiplier tube. The CPU compares the obtained average PMT response with a reference PMT response which provides an image of optimal uniformity to obtain data by which the average PMT response approaches the reference PMT response. Based on this data, the CPU obtains parameters of the waveform shaping circuit to provide a response close to the reference PMT response.