title: Neutron spectra at two beam ports of a TRIGA Mark III reactor loaded with HEU fuel.
abstract: The neutron spectra have been measured in two beam ports, one radial and another tangential, of the TRIGA Mark III nuclear reactor from the National Institute of Nuclear Research in Mexico. Measurements were carried out with the reactor core loaded with high enriched uranium fuel. Two reactor powers, 5 and 10 W, were used during neutron spectra measurements using a Bonner sphere spectrometer with a (6)LiI(Eu) scintillator and 2, 3, 5, 8, 10 and 12 in.-diameter high-density polyethylene spheres. The neutron spectra were unfolded using the NSDUAZ unfolding code. For each spectrum total flux, mean energy and ambient dose equivalent were determined. Measured spectra show fission, epithermal and thermal neutrons, being harder in the radial beam port.
authors.affiliation: Unidad Académica de Estudios Nucleares de la Universidad Autónoma de Zacatecas, C. Ciprés 10, Fracc. La Peñuela, 98068 Zacatecas, Zac. Mexico. Electronic address: fermineutron@yahoo.com.
authors.forename: H R
authors.initials: HR
authors.lastname: Vega-Carrillo
authors.forename: V M
authors.initials: VM
authors.lastname: Hernández-Dávila
authors.forename: F
authors.initials: F
authors.lastname: Aguilar
authors.forename: L
authors.initials: L
authors.lastname: Paredes
authors.forename: T
authors.initials: T
authors.lastname: Rivera
keywords: Bonner sphere spectrometer; Neutron spectrum; Research reactor