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A new approach for the evaluation of the effective electrode spacing in spherical ion chambers

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Proper determinationoftheeffectiveelectrodespacing(deff) ofanionchamberensuresproperde- termination ofitscollectionefficiency eitherincontinuousorinpulsedradiationinadditiontothe proper evaluationofthetransittime.Boag'smethodforthedeterminationofdeff assumes thespherical shape oftheinternalelectrodeofthesphericalionchamberswhichisnotalwaystrue,exceptforsome cases, itscommonshapeiscylindrical.Currentworkprovidesanewapproachfortheevaluationofthe effectiveelectrodespacinginsphericalionchambersconsideringthecylindricalshapeoftheinternal electrode. Resultsindicatedthatdeff valuesobtainedthroughcurrentworkarelessthanthoseobtained using Boag'smethodbyfactorsrangingfrom12.1%to26.9%.Currentmethodalsoimpactsthenumeri- cally evaluatedcollectionefficiency (f) wherevaluesobtaineddifferbyfactorsupto3%atlowpotential (V) valueswhileathigh V valuesminordifferenceswerenoticed.Additionally,impactsontheevaluation of thetransittime(τi) wereobtained.Itisconcludedthatapproximatingtheinternalelectrodeasa sphere mayresultinfalsevaluesof deff, f, and τi. ...

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A new approach for the evaluation of the effective electrode spacing in spherical ion chambers

A new approach for the evaluation of the effective electrode spacing in spherical ion chambers

Proper determinationoftheeffectiveelectrodespacing(deff) ofanionchamberensuresproperde- termination ofitscollectionefficiency eitherincontinuousorinpulsedradiationinadditiontothe proper evaluationofthetransittime.Boag'smethodforthedeterminationofdeff assumes thespherical shape oftheinternalelectrodeofthesphericalionchamberswhichisnotalwaystrue,exceptforsome cases, itscommonshapeiscylindrical.Currentworkprovidesanewapproachfortheevaluationofthe effectiveelectrodespacinginsphericalionchambersconsideringthecylindricalshapeoftheinternal electrode. Resultsindicatedthatdeff valuesobtainedthroughcurrentworkarelessthanthoseobtained using Boag'smethodbyfactorsrangingfrom12.1%to26.9%.Currentmethodalsoimpactsthenumeri- cally evaluatedcollectionefficiency (f) wherevaluesobtaineddifferbyfactorsupto3%atlowpotential (V) valueswhileathigh V valuesminordifferenceswerenoticed.Additionally,impactsontheevaluation of thetransittime(τi) wereobtained.Itisconcludedthatapproximatingtheinternalelectrodeasa sphere mayresultinfalsevaluesof deff, f, and...

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