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1、222220OptimizationofRn/RnabsolutemeasurementinstrumentbasedonasmallscintillationcellAbstractUpuntilnow,co-measurementmethodanddevicesarereallyrareworldwide,222andabsolutemeasurementdevicesarestillontheway.Though,devicesforRnmeasurementarewidelyused,itsmeasurementsta
2、ndardshavenotcomeintobeing.222220Asaresult,theresearchanddevelopmentofdeviceforRn/Rnmeasurementcarryalotofmeaningsfortheco-measurementmethod,especiallyforthe220establishmentofRnmeasurementstandards.Preliminarydevelopmentof222220instrumentforabsolutemeasurementofRn/R
3、nhasbeencompleted.The222/220samplingcount,RnRnconcentrationcalculationandenvironmentalparameters222220andtheconcentrationofRn/RnPCdisplayarebasicallyrealized.Inother222220words,theinstrumentbearsthebasicfunctionsneededfortheRn/Rnabsolutemeasuringinstrument.222220Ino
4、rdertothesinglesmallscintillationcellRn/Rnabsolutemeasurementprototypeismoreintegrated,man-machineinterfaceismoreoptimized,moreoperationalandfunctional,whichmakesitmoreconvenientforthefuturepromotionoftheinstrument.Thisstudyisbasedonapreliminaryprototypetooptimizede
5、sign,includinghardwarecomplementation,softwarerefinement,prototypedebuggingandtechnicalparameterstest.Themaincontentsaredividedintothreepartsasfollows.Designalowdeadtimepulseamplitudeanalyzer,carryoutfeasibilityanalysisbysoftwaresimulation.Aliquidcrystaldisplaymodul
6、eisusedforreal-timedisplayoftheenvironmentalparameters.GiventhatthecomplicationofcircuitandlackofI/Oports,designaenvironmentparametersamplinganddisplayI/Oportconservationprogram,couplingwithSPIcommunication,tomakethewholesystemoccupiesonly7I/Oports.Thedesignoftheman
7、-machineinterfaceoptimizationandsavealargedegreeofportiv万方数据resources.Theportresourceisthusoptimized.Thesamplinggasflowcontrol.ThecontrolofgasflowisrealizedbypumpcontrolcompletedbythesoftwareviaPWMmethod.Samplingflowprecisioncontrolafterexperimental,getthedutyratioi
8、ngoodlinearrelationshipbetweenthesamplingflow.Thismakestheprototypemoreoperational.222220Keywords:Rn/Rn、absolutemeasurement、optimization.v
