| 摘要 |
PURPOSE:To attain pictures with good linearity by a camera wherein output from each photoelectric converter disposed in rear of a scintillator is divided by the total output to be normalized, and locational arithmetic operation is performed after conversion from non-linear characteristic to linear characteristic. CONSTITUTION:Fluorescence generated by radiation incident upon a scientillator 1 enters PMT 31-3n, which outputs are fed via preamplifiers 41-4n to an adder 5 where they are totally added. When an added signal (a) exceeds a given value in a trigger circuit 6, a trigger signal (b) is applied to integration circuits 80-8n and also fed to a timing generating circuit 7 to issue a signal (c). The signal (a) and the output from each preamplifier are respectively integrated in a period from the signal (b) to (c) by the circuit 80 and the circuits 81-8n. In division circuits 101-10n, outputs from the circuits 81-8n are divided by the output of the circuit 80 and then stored in memories 131-13n, respectively. These data signals are applied via D/A converters 141-14n to X- and Y-direction positional arithmetic circuits 15, 17 of weighed addition type. A picture 21 with good linearity can be attained from outputs of these circuits 15, 17. |
