Abstract: A preamplifier for a wide range neutron flux monitoring system is disclosed. The preamplifier contains first to fifth amplifiers and a selection switch. The first amplifier for high frequency band amplification has a low input impedance circuit. The second amplifier for low frequency band amplification has a high input impedance circuit. Either of the first and second amplifiers can provide a path for the neutron flux level signal derived from a detector according to the frequency of the neutron flux level signal. The third amplifier (pulse amplifier) amplifies the output signal of the first amplifier and transfers the amplified signal to a pulse signal counting system. The lower frequency band Campbell signal is applied to the Campbelling system, through the second amplifier, the fourth amplifier (low frequency band Campbelling amplifier), and the selection switch.

Abstract: A neutral particle analyzer has a stripping cell for converting a neutral beam into a charged particle beam, a momentum analyzer for deflecting paths of respective charged particles of the charged particle beam emerging from the stripping cell in correspondence with momenta thereof, and a semiconductor energy analyzer comprising a plurality of semiconductor detectors which are arranged in the paths of deflected charged particle beams emerging from the momentum analyzer. The semiconductor energy analyzer generates pulse signals having pulse heights corresponding to masses of and kinetic energies of the deflected charged particles of the deflected charged particle beams.

Abstract: In a neutron detector of the type comprising an ionization chamber provided with anode and cathode electrodes for detecting neutron flux injected into the ionization chamber, and a cable including a central conductor connected to the anode or cathode electrode and the outer conductor connected to the cathode or anode electrode there are provided an intermediate insulated annular conductor arranged between the inner and outer conductors of the cable, and upper and lower insulated annular conductors disposed between the anode and cathode electrodes for supporting one of them. The upper and lower insulated annular conductors are electrically interconnected and the upper insulated annular conductor is connected to the intermediate annular conductor of the cable.

Abstract: A compact single- or multi-channel radiation detector capable of sending forth a large and stable output signal by being operated in a proportional region which comprises a single or a plurality of electrode assemblies each prepared by inserting between a pair of mutually facing parallel high voltage electrodes an electric charge-collecting electrode having a plurality of metal wires spatially arranged in a plane parallel with said paired high voltage electrodes, and wherein the single or plural electrode assemblies are received in a case provided with a radiation inlet section and filled with a gaseous element mainly consisting of a rare gas such as argon or xenon.

Abstract: A radiation detection element comprises an insulating base frame having a pair of leg portions with a spacing left therebetween, a pair of electroconductive members each disposed on one surface of the corresponding leg portions of the base frame, an electrode plate disposed on the rear surface of the base plate to cover the spacing between the leg portions, and a plurality of signal electrode wires spanned between the electroconductive members such that they confront the electrode plate, in which an insulating member is disposed between the base frame and the electroconductive member and/or between the base frame and the electrode plate such that its longitudinal edge portion is overhung into the spacing of the base frame.