AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Published Online: 2016-06-01
Published Print: 2016-06-30
VIEW PDF: THE PRODUCTION OF THE RADIOISOTOPES 165 Dy, 166 Ho, 171Er, 124 Sb FOR BRACHYTHERAPY USE
The thermal neutron cross-sections (σ) of the reactions 164Dy(n,γ) 165Dy, 165Ho(n,γ)166Ho, 170Er(n, γ)171Er, 123Sb(n, γ)124Sb were measured by the activation method. The powder samples were irradiated in an isotropic neutron field obtained from the 241Am-Be and 239Pu-Be neutron sources, moderated with paraffin wax. The γ-ray spectra from the irradiated samples were measured by high resolution γ-ray spectrometry with a calibrated n-type Ge detector. The thermal neutron cross-sections for the reactions studied has been determined to be as follows: for 164Dy(n,γ) 165Dy reaction 2400±200 barns, for 165Ho(n,γ)166Ho reaction 55.3±12 barns, for 170Er(n, γ)171Er reaction 1.3±2 barns and for 123Sb(n, γ)124Sb reaction 3.5±0.5 barns. The thermal neutron cross sections for the reactions 164Dy(n,γ) 165Dy, 165Ho(n,γ)166Ho and 123Sb(n, γ)124Sb are in good agreement, within limits of uncertainty, with most of the values in the literature. The thermal neutron cross section for the reaction 170Er(n, γ)171Er was not in good agreement with the values in the literature, but it is a measurement that has been made, and it can be evaluated again in the future.
Keywords: neutrons, gamma spectroscopy, capture reactions, effective section, isotopes radioactive
