MonteCarlonumericalcalculationsoftheresponseofalanineandammoniumtartrateESR(electron spin resonance)dosimetersexposedtoneutronfieldswithdifferentenergyspectraarereported.Results havebeenobtainedforvariousgadoliniumconcentrationsinsidethedosimeters.Furthermore,inorder to simulatethein-phantomresponsewehavecarriedoutcalculationsbyvaryingthedepthofthe dosimeter.Wehavefoundthatalargeenhancementisobtainedforthermalneutrons,becauseofthe very highcapturecrosssectionofgadoliniumtothermalneutrons.Agoodenhancementwasobtained for epithermalneutrons,whereasthesensitivityimprovementinthecaseoffastneutronirradiationis poor.Furthermore,thesimulationscarriedoutbyvaryingthedepthsuggeststhatanappreciable sensitivitytothermalandepithermalneutronscouldbeobservedforin-phantommeasurementsinthe 2–3cmdepthrange.Theseresultscanprovideusefulinsightforfutureexperimentswithepithermal neutronbeams(suchasthoseusedinneutroncapturetherapy)andforfutureapplicationsinneutron capturetherapydosimetry.
Marrale, M., Basile, S., Brai, M., Longo, A. (2009). Monte Carlo simulation of the response of ESR dosimeters added with gadolinium exposed to thermal, epithermal and fast neutrons. APPLIED RADIATION AND ISOTOPES, 67(7), 186-189 [10.1016/j.apradiso.2009.03.046].
Monte Carlo simulation of the response of ESR dosimeters added with gadolinium exposed to thermal, epithermal and fast neutrons.
MARRALE, Maurizio;BASILE, Salvatore;BRAI, Maria;LONGO, Anna
2009-01-01
Abstract
MonteCarlonumericalcalculationsoftheresponseofalanineandammoniumtartrateESR(electron spin resonance)dosimetersexposedtoneutronfieldswithdifferentenergyspectraarereported.Results havebeenobtainedforvariousgadoliniumconcentrationsinsidethedosimeters.Furthermore,inorder to simulatethein-phantomresponsewehavecarriedoutcalculationsbyvaryingthedepthofthe dosimeter.Wehavefoundthatalargeenhancementisobtainedforthermalneutrons,becauseofthe very highcapturecrosssectionofgadoliniumtothermalneutrons.Agoodenhancementwasobtained for epithermalneutrons,whereasthesensitivityimprovementinthecaseoffastneutronirradiationis poor.Furthermore,thesimulationscarriedoutbyvaryingthedepthsuggeststhatanappreciable sensitivitytothermalandepithermalneutronscouldbeobservedforin-phantommeasurementsinthe 2–3cmdepthrange.Theseresultscanprovideusefulinsightforfutureexperimentswithepithermal neutronbeams(suchasthoseusedinneutroncapturetherapy)andforfutureapplicationsinneutron capturetherapydosimetry.
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