Development Of The Irradiation Monitoring System For Heavy-ion Microfiltration Membranes

Heavy-ion microfiltration membranes (hereafter be shorted as microfiltrationmembranes) is the application of nuclear technology to produce a track-etchedmembranes, belonging to the sieve-type film fine filter media. Microfiltrationmembranes having a micron porous nuclear tracks formed, these micropores areformed by the processing by nuclear facilities.In general, nuclear microfiltrationmembranes are producted by radiation with the reactor or accelerator. Its preparedby several in-dependent steps: heavy-ion irradiation processing, sensitization andchemical etching.The nuclear microporous membrane of this paper is the application of the MeVheavy-ion provided by the China Institute of Atomic Nuclear Physics InstituteHI-13electrostatic tandem accelerator.Irradiation is the key to the productionprocess, the irradiation procedure determines the density distribution of the nuclearpore, directly affect the its quality.Therefore, keep abreast of the radiation intensityand the density distribution of the nuclear pore accurately has practicalsignificance.Not only can improve the nuclear microporous membrane productionquality, also can let the staff know about the irradiation time, decrease the workload,reduce the waste of time and save the cost of irradiation.This paper introduces in detail the development, manufacturing process andtest results of ideas for the Irradiation Monitoring System for Heavy-ionMicrofiltration Membranes developed for HI-13electrostatic accelerator L70° irradiation equipment. Innovatively adopted the measurement which isunder-membranes.When the heavy-ion beam through the membranes,its hit Faradaycup detector, current signal produced is proportional to the beam intensity, thecurrent signal through the I-V converter current is amplified and converted into avoltage signal, the signal collection by the virtual instrument test system and outputdisplay. Innovatively adopted the measurement which is under-membranes.Whenthe heavy-ion beam through the membranes,its hit Faraday cup detector, currentsignal produced is proportional to the beam intensity, the current signal through theI-V converter current is amplified and converted into a voltage signal, the signalcollection by the virtual instrument test system and output display.In the detector, this paper adopts the improved Faraday cup detector, whichuse the principle of the Faraday cup detector combined with the workingmechanism of electron multiplier, making flaky Faraday cup detector.Virtualinstrument test system is made by the multi-channel date collection card andLabWindows/CVI software platform developed by NI company.Its can realizereal-time data acquisition of multi-channel signals and display outputsynchronously.Proved by the experiment, the measurement data obtained from theIrradiation Monitoring System for Heavy-ion Microfiltration Membranes proposedin this paper and the nuclear pore density value can keep relatively stableproportional relationship.And this result also proved the feasibility and theusefulness of the measurement system.