Designation:E1855−15StandardTestMethodforUseof2N2222ASiliconBipolarTransistorsasNeutronSpectrumSensorsandDisplacementDamageMonitors1ThisstandardisissuedunderthefixeddesignationE1855;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheuseof2N2222Asiliconbipolartransistorsasdosimetrysensorsinthedeterminationofneutronenergyspectraandas1Mev(Si)equivalentdisplace-mentdamagefluencemonitors.1.2Theneutrondisplacementinsiliconcanserveasaneutronspectrumsensorintherange0.1to2.0MeVwhenfissionfoilsarenotavailable.Ithasbeenappliedinthefluencerangebetween2×1012n/cm2to1×1014n/cm2andshouldbeusefulupto1×1015n/cm2.Thistestmethoddetailstheacquisitionanduseof1Mev(Si)equivalentfluenceinforma-tionforthepartialdeterminationoftheneutronspectrabyusing2N2222Atransistors.1.3Thissensoryieldsadirectmeasurementofthesilicon1Mevequivalentfluencebythetransfertechnique.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryrequirementspriortouse.2.ReferencedDocuments2.1TheASTMstandardsE170,E261,andE265provideabackgroundforunderstandinghowsensorsareusedinradia-tionmeasurementsandgeneraldosimetry.Therestofthestandardsreferencedinthelistdiscussthechoiceofsensors,spectrumdeterminationswithsensordata,andthepredictionofneutrondisplacementdamageinsomesemiconductordevices,particularlysilicon.2.2ASTMStandards:2E170TerminologyRelatingtoRadiationMeasurementsandDosimetryE261PracticeforDeterminingNeutronFluence,FluenceRate,andSpectrabyRadioactivationTechniquesE265TestMethodforMeasuringReactionRatesandFast-Neu...
