0000000000362124

AUTHOR

Alberto Zeffiro

showing 3 related works from this author

EPR/ALANINE PELLETS WITH LOW Gd CONTENT FOR NEUTRON DOSIMETRY

2013

This paper reports on results obtained by electron paramagnetic resonance (EPR) measurements and Monte Carlo (MC) simulation on a blend of alanine added with low content of gadolinium oxide (5 % by weight) to improve the sensitivity to thermal neutron without excessively affecting tissue equivalence. The sensitivity is enhanced by this doping procedure of more an order of magnitude. The results are compared with those obtained with the addition of boric acid (50 % by weight) where boron is in its natural isotopic composition in order to produce low-cost EPR dosemeters. The gadolinium addition influences neutron sensitivity more than the boron addition. The presence of additives does not sub…

inorganic chemicalsMaterials scienceGadoliniumAnalytical chemistrychemistry.chemical_elementGadoliniumRadiation Dosagelaw.inventionBoric acidchemistry.chemical_compoundBoric AcidsIsotopeslawRadiology Nuclear Medicine and imagingNeutronIrradiationBoronElectron paramagnetic resonanceRadiometryNeutronsRadiationAlanineRadiological and Ultrasound Technologybusiness.industryElectron paramagnetic resonance (EPR) alanine pellet gadolinium Monte Carlo (MC) simulation dosimetryDopingtechnology industry and agriculturePublic Health Environmental and Occupational HealthElectron Spin Resonance SpectroscopyGeneral MedicineNeutron temperatureSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)chemistryNuclear medicinebusinessMonte Carlo Method
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ESR response of phenol compounds for dosimetry of gamma photon beams

2014

Abstract In the present paper we investigate the features of IRGANOX® 1076 phenols as a material for electron spin resonance (ESR) dosimetry. We experimentally analyzed the ESR response of pellets of IRGANOX® 1076 phenols irradiated with 60Co photons. The best experimental parameters (modulation amplitude and microwave power) for dosimetric applications have been obtained. The dependence of ESR signal as function of γ dose is found to be linear in the dose range studied (12–60 Gy) and the lowest measurable dose is found to be of the order of 1 Gy. The signal after irradiation is very stable in the first thirty days. From the point of view of the tissue equivalence, these materials have mass…

Nuclear and High Energy PhysicsRange (particle radiation)PhotonPhenolChemistryAnalytical chemistrySignalSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)law.inventionNuclear magnetic resonanceAmplitudelawAttenuation coefficientElectron spin resonanceDosimetryDosimetryPhoton beamIrradiationElectron paramagnetic resonanceInstrumentation
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Study of the response of phenol compounds exposed to thermal neutrons beams for Electron Paramagnetic Resonance dosimetry

2015

Abstract This paper reports the results regarding a new organic compound (IRGANOX ® 1076 phenols) with and without low content (5% by weight) of gadolinium oxide (Gd 2 O 3 ) for Electron Paramagnetic Resonance (EPR) dosimetry of neutron beams. The dependence of EPR signal as function of neutron dose was investigated in the fluence range studied between 10 11  cm −2 to 10 14  cm −2 . We evaluated also the effect of gadolinium on 60 Co gamma photon sensitivity of this organic compound. Our analysis showed that a low concentration of gadolinium oxide (of the order of 5% of the total mass of the dosimeter) can enhance the thermal neutron sensitivity more than 10 times with a small reduction of …

inorganic chemicalsRadiationDosimeterChemistrySettore ING-IND/18 - Fisica Dei Reattori NucleariSettore ING-IND/20 - Misure E Strumentazione NucleariGadoliniumRadiochemistrySettore FIS/01 - Fisica Sperimentalechemistry.chemical_elementGadoliniumFluenceNeutron temperatureSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)law.inventionElectron Paramagnetic ResonanceNCT dosimetryPhenolslawDosimetryNeutronIrradiationElectron paramagnetic resonanceInstrumentationNeutron beam
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