Search results for " ammonium tartrate"

showing 5 items of 5 documents

EXPOSURE OF Gd2O3-ALANINE AND Gd2O3-AMMONIUM TARTRATE ESR DOSIMETERS TO THERMAL NEUTRONS: EXPERIMENTS AND MONTE CARLO SIMULATIONS

2008

ESR dosimetry alanine ammonium tartrate Monte Carlo simulationSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)
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ESR spectroscopy for analyzing the spatial distribution of free radicals in ammonium tartrate

2013

ESR spectroscopy spatial distribution of free radicals ammonium tartrateSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)
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RADICAL DISTRIBUTIONS IN AMMONIUM TARTRATE SINGLE CRYSTALS EXPOSED TO PHOTON AND NEUTRON BEAMS

2014

The radiation therapy carried out by means of heavy charged particles (such as carbon ions) and neutrons is rapidly becoming widespread worldwide. The success of these radiation therapies relies on the high density of energy released by these particles or by secondary particles produced after primary interaction with matter. The biological damages produced by ionising radiations in tissues and cells depend more properly on the energy released per unit pathlength, which is the linear energy transfer and which determines the radiation quality. To improve the therapy effectiveness, it is necessary to grasp the mechanisms of free radical production and distribution after irradiation with these …

Materials sciencePhotonFree RadicalsTrack nanodosimetryLinear energy transferElectronsRadiationMolecular physicsIonizing radiationMagneticsRadiation IonizingRadiology Nuclear Medicine and imagingHeavy IonsIrradiationCobalt RadioisotopesRadiometryTartratesNeutronsRange (particle radiation)PhotonsRadiationRadiological and Ultrasound TechnologyRadiation induced radicals ammonium tartrate pulsed electron paramagnetic resonanceelectron spin resonancePublic Health Environmental and Occupational HealthElectron Spin Resonance SpectroscopyGeneral MedicineCharged particleNeutron temperatureSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)CarbonGamma RaysTrack nanodosimetry; electron spin resonanceCrystallization
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Determination of New Radical Species in Ammonium Tartrate Dosimeters by CW- and Pulsed-EPR Techniques

2015

Samples of ammonium tartrate irradiated with doses of about 0.1–1 kGy by different beams of ionizing radiation (60Co–γ, 19 MeV protons and 62 MeV per nucleon carbon ions) were studied by continuous-wave electron paramagnetic resonance (cw-EPR) and by pulse-EPR techniques. Careful analysis of the cw-EPR and of the echo-detected EPR spectra allowed the identification of a second radical in the system besides the already known radical formed at high temperature by an hydrogen elimination at C(2) position [M. Brustolon et al., Res. Chem. Int 4:359, 1996]. The spectrum of the radical is compatible with that of a radical obtained by hydroxyl elimination.

Dosimeterammonium tartrateHydrogenPulsed EPRchemistry.chemical_elementAtomic and Molecular Physics and OpticsSpectral lineIonIonizing radiationlaw.inventionDosimetry; electron paramagnetic resonance; ammonium tartrateelectron paramagnetic resonancechemistrylawDosimetryPhysical chemistryIrradiationElectron paramagnetic resonanceNuclear chemistryApplied Magnetic Resonance
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ESR RESPONSE TO 60 CO-RAYS OF AMMONIUM TARTRATE PELLETS USING GD2O3 AS ADDITIVE.

2007

This work presents experimental results regarding a new ammonium tartrate blend for ESR dosimetry, with a higher sensitivity and a lower lowest detectable dose (LDD) to 60 Co -rays than the recently used pure ammonium tartrate. The blend composed by ammonium tartrate and gadolinium-oxide (Gd2 O3 ) shows a greater sensitivity (∼2 times) and a smaller LDD than ammonium tartrate. The increased sensitivity was mainly attributed to the great atomic number (Z = 64) of gadolinium, that increases the effective atomic number of the blend; the interaction probability with photons and consequently the radical yield is therefore enhanced. Moreover ammonium tartrate with Gd2 O3 has a linear dose respons…

ESR; Ammonium tartrate; Gd2O3–ammonium tartrateESRAmmonium tartrateGd2O3–ammonium tartrate
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