title: Determination of low level Np-237 by various techniques.
abstract: Determination of a low level237Np in environmental samples was performed by various techniques: i) a direct gamma-ray spectrometry, ii) an alpha-particle spectrometry that followed pre-separation of neptunium radioisotope(s) by ion-exchange or extraction chromatography and iii) pre-separation radiochemical neutron activation analysis. The methods used were applied to various reference materials with inorganic and organic matrix as well as to a wide range of neptunium content. The results were compared with reference and literature values.
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. Electronic address: ljudmila.benedik@ijs.si.
authors.forename: L
authors.initials: L
authors.lastname: Benedik
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: M
authors.initials: M
authors.lastname: Trdin
keywords: Alpha-particle spectrometry; Gamma-ray spectrometry, pre-separation radiochemical neutron activation analysis, reference materials; Neptunium; Radiochemical separation