Designation:F448−11StandardTestMethodforMeasuringSteady-StatePrimaryPhotocurrent1ThisstandardisissuedunderthefixeddesignationF448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthemeasurementofsteady-stateprimaryphotocurrent,Ipp,generatedinsemiconductordeviceswhenthesedevicesareexposedtoionizingradiation.Theseproceduresareintendedforthemeasurementofphotocurrentsgreaterthan10−9A·s/Gy(SiorGe),incasesforwhichtherelaxationtimeofthedevicebeingmeasuredislessthan25%ofthepulsewidthoftheionizingsource.Thevalidityoftheseproceduresforionizingdoseratesasgreatas108Gy(SiorGe)/shasbeenestablished.Theproceduresmaybeusedformea-surementsatdoseratesasgreatas1010Gy(SiorGe)/s;however,extracaremustbetaken.Above108Gy/s,thepackageresponsemaydominatethedeviceresponseforanydevice.Additionalprecautionsarealsorequiredwhenmeasur-ingphotocurrentsof10−9A·s/Gy(SiorGe)orlower.1.2Setup,calibration,andtestcircuitevaluationproceduresarealsoincludedinthistestmethod.1.3Becauseofthevariabilitybetweendevicetypesandintherequirementsofdifferentapplications,thedoseraterangeoverwhichanyspecifictestistobeconductedisnotgiveninthistestmethodbutmustbespecifiedseparately.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E668PracticeforApplicationofThermoluminescence-Dosimetry(TLD)SystemsforDeterminingAbsorbedDoseinRadiation-HardnessTestingofElectronicDevicesF526TestMethod...
