Search results for "High atomic number"

showing 4 items of 4 documents

ESR response to gamma-rays of alanine pellets containing B(OH)3 or Gd2O3.

2007

ESR response to gamma-irradiation (1-50 Gy) of blends containing alanine and either B(OH)(3) or Gd(2)O(3) is reported. The sensitivity of the alanine--B(OH)(3) blend is comparable to the sensitivity of pure alanine, although its lowest detectable dose, LDD, is smaller ( approximately 1.3 Gy) than that of pure alanine ( approximately 2.9 Gy). Alanine with Gd(2)O(3) is about two times more sensitive than pure alanine, and its LDD is 0.8 Gy. The better sensitivity and LDD are probably due to the high atomic number (Z=64) of gadolinium, which enhances the interaction probability with photons and, consequently, the radical yield. This study suggests that other high-Z atoms may be useful for incr…

AlanineHigh atomic numberRadiationAlanineGadoliniumRadiochemistryPelletsElectron Spin Resonance Spectroscopychemistry.chemical_elementGadoliniumESR; Alanine; B(OH)3; Gd2O3; Sensitivity; Mass energy absorption coefficientMass energy absorption coefficientSensitivitychemistryBoric AcidsIsotopesGd2O3Gamma RaysYield (chemistry)RadiometryB(OH)3ESRBoronApplied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
researchProduct

THE EFFECT OF GADOLINIUM ON THE ESR RESPONSE OF ALANINE AND AMMONIUM TARTRATE EXPOSED TO THERMAL NEUTRONS

2008

Many efforts have been made to develop neutron capture therapy (NCT) for cancer treatment. Among the challenges in using NCT is the characterization of the features of the mixed radiation field and of its components. In this study, we examined the enhancement of the ESR response of pellets of alanine and ammonium tartrate with gadolinium oxide exposed to a thermal neutron beam. In particular, the ESR response of these dosimeters as a function of the gadolinium content inside the dosimeter was analyzed. We found that the addition of gadolinium improves the sensitivity of both alanine and ammonium tartrate. However, the use of gadolinium involves a reduces in or abolishes tissue equivalence b…

High atomic numberHot TemperatureGadoliniumBiophysicschemistry.chemical_elementGadoliniumRadiation DosageSensitivity and SpecificityRadiology Nuclear Medicine and imagingAmmonium tartrateRadiometryTartratesAlanineNeutronsRadiationDosimeterAlanineRadiation fieldRadiochemistryElectron Spin Resonance SpectroscopyReproducibility of ResultsDose-Response Relationship RadiationNeutron temperatureSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Neutron capturechemistryESR dosimetry thermal neutronsNuclear chemistry
researchProduct

Streuung von mittelschnellen Elektronen an Kunststoff-Folien mit eingelagerten Schwermetallatomen

1962

Scattering has been observed of 70-keV electrons by Kollodium-foils containing elements of high atomic number (lead). The contents of lead are determined and the kind of distribution of lead in the foil is described. The differential cross-section as a function of the angle of scattering approximates the cross-section calculated by Sherman with lower contents of lead of the foils. Remaining deviations can be explained by screening-effects of the electron cloud.

High atomic numberPhysicsNuclear and High Energy PhysicsAtomic orbitalPhysics::Instrumentation and DetectorsScatteringNuclear fusionElectronAtomic physicsFOIL methodZeitschrift f�r Physik
researchProduct

Kunststoff-Folien mit eingelagerten Schwermetallatomen f�r Elektronenstreuung

1964

Completing a former paper about scattering experiments with electrons a new foil containing an element of high atomic number (lead) has been produced, which shows a very equal and fine distribution of lead.

High atomic numberPhysicsNuclear and High Energy PhysicsScatteringElectronAtomic physicsFOIL methodZeitschrift f�r Physik
researchProduct