| 摘要 |
A device for determining the position coordinates of a scintillation on the anode screen of an image intensifier tube, which forms part for instance of a gamma camera containing five photomultipliers, four of which being mounted in a square that is centred on the axis of the fifth, the difference of the voltages of two multipliers divided by the voltage of the fifth multiplier being used as signal representative for one position coordinate, filters of which the transmittance varies over the surface being applied to the fifth photomultiplier and the anode screen to compensate for distortion and vignetting of the image on the anode screen.
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