MISCELLANEOUS DETECTORSRadiation DetectorsSummaryA description of how self-powered neutron detectors, wide range fission chambers, flux wires,and photographic film detect radiation is summarized below.Miscellaneous Detector SummarySelf-powered neutron detectorThe central wire, made of a neutron-absorbing material, absorbs a neutron andundergoes beta decay.As more beta decays occur, the remaining atoms cause the wire to become morepositively charged.The voltage potential set up causes a current flow in a resistor, which ismeasured by either a millivoltmeter or electrometer.Wide range fission chamberNeutrons interact with the U235 coated chamber causing fission of the U235.A highly positive charged fission fragment interacts with the detector gas andcauses ionizations.The electrons produced are collected as pulses on the electrode.Flux wireThe wire is inserted directly into the core and becomes activated by the neutronflux.When the desired activation time is reached, the wire is removed from the coreand counted.Photographic filmDetects total radiation dose by darkening; film darkness determines overallexposure.Fast neutron exposure determined by counting individual proton recoil tracks.IC-06 Page 54 Rev. 0
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