| 摘要 |
PURPOSE:To decrease the number of sets of equipment by selecting many neutron detectors in order, selecting a current obtained by each neutron detector and a current signal obtained through a compensation conductor at the same period, and computing the deviation of an output signal. CONSTITUTION:Many self-output type neutron detectors 11-1n arranged at neutron detection places have MI cables 121-2n, wherein compensation conductors 31-3n are provided. These cables 21-2n are connected to a multiplexer as a 1st selecting means and the compensation conductor 31-3n are connected to a multiplexer 62 and a 2nd selecting means. In this case, the multiplexers 61 and 62 operate associatively with each other and output the current signal of the same neutron detector at the same period. Further, current- voltage converters 41 and 42 are connected to the multiplexers 61 and 62, the output terminal of the converter 41 is connected to the plus terminal of an operational amplifier 5, and the output terminal of the converter 42 is connected to the minus terminal of the amplifier 5; and an A-D converter 7 is connected to the output side of the amplifier 5.
|
