datawwe2014年7月21日

2014IMP&HIRFLAnnualReport·273·Table1BeamDynamicsParameters.
InputparametersBunchcharge/nC0.
5Bunchradius/mm1HalfwidthofGaussian/()1.
5Injectionphase/()varyfrom22to25AverageeldofRFGun/(MV/m)100ParametersafteroptimizationMultiofBsolenoid1.
033CenterpositionofBsolenoid/cm23.
37Injectionphase/()22.
2positionofenteringthebooster&Zminof[Xrms]/cm127.
87BeamRMSsize/mm0.
54HorizontalEmittance/(mm·mrad)1.
07Beamenergy/MeV80.
306-22RadiationSafetyReportofHIRFLin2014SuYouwu,XuJunkui,LiZongqiang,MaoWang,LiWuyuan,XuChong,YanWeiweiandPangChengguoThetotaloperationtimeofHIRFLis7272hin2014,andtheuserbeamtimeisabout4964.
5h(from21stDec.
2013to21stDec.
2014).
3749hforphysicsexperiment,332hforlifescienceresearch,883.
5hformaterialscienceandsingleparticleeectresearch,and235hformachineresearch.
Thereare24heavyionsbeamswereprovidedbyHIRFLin2014.
Thehighestionsenergyprovidedis487MeV/u,andthemaximumaccumulatedionintensityis1000A.
EnvironmentradiationlevelwasmeasuredwithTLDswhichwereplacedintheyardinstitutearoundHIRFL,15sitesofradiationlevelshownodierencewithenvironmentbackgroundlevelofGansuprovinc[1].
Furthermore,environmentalneutronandgammadosewasmonitoredby3environmentradiationmonitoringstationscontinuously,noabnormaldatahadbeenfoundin2014.
Environmentalradiationdoseofneutronandγrayhadbeenmeasuredwithportabledosemeterfourtimesayear.
Themeasuredresultsshownodierencewithbackground(Table1).
Table1EnvironmentdosesurroundingHIRFL.
LocationDirectionDistance/mNeutrondoserate/(nSv/h)γdoserate/(nSv/h)ExperimentalhalldoorSouth1023.
188ThenorthgateofIMPSouth507.
051032#buildingEast529.
2856#buildingNorthwest513.
390West520.
581Southwest1010.
174Northeast5920.
0176Measuringtime:March26th,2014;beam:70MeV/u40Ar8+atRIBLL1;survey:FHT762neutrondosimeter,BH-3013Bγdosimeter.
Theexternaldosereceivedbyworkersmainlyduetotheresidualradiationaftertheacceleratorwasshutdown.
Maximumsurfacedoseratehadbeenmeasuredin2014is4mSv/hontheSFCdeectorsurface.
Toreducetheexternaldoseofworkers,adequatecoolingtime,andreducingtheoperatingtimeisessential.
291personsacceptedindividualdosemonitoringin2014,andtheresultsareshowninTable2.
Theannualcollectiveeectivedosewas34.
92mSv.
35ofthemarelessthan0.
1mSv.
Thehighestindividualdosewasabout1.
49mSv,whichwasunderthedoselimit(20mSv)ofnationalstandard.
·274·IMP&HIRFLAnnualReport2014Table2Individualdosemonitoringresultsin2014.
TimeNumberofmonitoredindividualsAnnualcollectiveeectivedose/mSvAverageannualeectivedose/mSvNumberofindividualswithdierentannualeectivedose/mSv<0.
10.
11155101020≥20201429134.
920.
12352524(1.
49mSv)000Table3Totalα,βradioactivityoftheenvironmentalsamplesin2014.
SiteWater/(Bq/L)SiteSoil/(Bq/kg)Plant/(Bq/kg)αβαβαβHuanghenewbridge0.
90.
14NorthofCSRe591.
3731.
313.
1107.
9Sangyuanzibridge0.
130.
17Southoftheinstitute726.
6860.
222.
4155.
1Tapwater0.
0930.
06Northof6#building494.
8850.
913.
8120.
7Wastewater0.
10.
14Westof6#building555.
4888.
114.
997.
0NorthofRWS594.
1959.
020.
9173.
0WestofRWS698.
8858.
523.
0129.
0EastofRWS744.
3842.
423.
1152.
6SouthofRWS565.
1725.
114.
0172.
7Totalα,βradioactivityinsoil,water,plantsamplesfromenvironmentaroundHIRFLandsoil,plantsamplesfromRadioactiveWasteStoreroom(RWS)aremeasuredwithBH1216lowbackgroundα,βMeasuringInstrument,theresultsareshowninTable3,andcomparedwiththebackgroundlevelofChina[2].
RadiationsafetylicenseofIMPwhichwasawardedbyMinistryofEnvironmentalProtectionwasrenewedin2015,furthermore,severalradiationfacilitieswerelistinthepermit,whichmeansalloftheseradiationfacilitiesrunninginIMPyardwerepermittedbylaw.
References[1]ChuntingLiu,ShumingBai,XiuyingRen,etal.
,RadiationProtection,16(1996)121.
[2]Theinvestigationgroupofnationalenvironmentalnaturalradioactivitylevel,RadiationProtection,12(1996)122.
6-23ComparisonResultsofNationalIndividualDoseofIMPin2014MaoWang,LiWuyuanandSuYouwuIMPparticipatedinthecomparisonofnationalindividualdosewhichwasorganizedbyNationalInstituteforRadiologicalProtection,ChinaCDC,andthecomparisonresultswerecorrectedandwasgrantedwithcerticate.
Inthecomparison,RGD-3Breader,LiF(Mg,Cu,P)detectors,FJ411BannealingfurnaceandTLD400detectorboxwereused.
TheRGD-3BmeasuringsystemandLiF(Mg,Cu,P)thermoluminescencedetectorswerecalibratedin2014.
Fivegroupsdosimetersmarkednumber1tonumber5whichusedforroutinemonitorwereselectedtothecomparison,eachgroupwithtendetectors.
Therstvegroupswereblandsamples.
Group6wasstandbysampleandgroup7wasforbackgrounddosemonitor.
Therst5groupswereexposedbytheorganizerinastandardatwaterphantominunknowndirectionwithXorγrays(accordingtoISOspectrumnorm)withvedierentunknownindividualdoseequivalentvaluesHp(10).
Themeasuredvalueswereobtainedaccordingtocalibrationfactors,readoutvalues,andthecorrespondingbackgroundvalues.
Therelativeerrorofeachgroupinthecomparisoncanbecalculatedasfollows:Pi=[H′iHi]/Hi,(1)whereH′iismeasuredvalue,Hiistheexposedvaluewhichwedon'tknowinadvance,Piistherelativeerror.
If|Pi|≤0.
4[1],Piofallthevegroupsiswithin0.
4,theresultswereconsideredtobecredible.