title: Standardization of Ga-68 by coincidence measurements, liquid scintillation counting and 4πγ counting.
abstract: The radionuclide (68)Ga is one of the few positron emitters that can be prepared in-house without the use of a cyclotron. It disintegrates to the ground state of (68)Zn partially by positron emission (89.1%) with a maximum energy of 1899.1 keV, and partially by electron capture (10.9%). This nuclide has been standardized in the frame of a cooperation project between the Radionuclide Metrology laboratories from CIEMAT (Spain) and CNEA (Argentina). Measurements involved several techniques: 4πβ-γ coincidences, integral gamma counting and Liquid Scintillation Counting using the triple to double coincidence ratio and the CIEMAT/NIST methods. Given the short half-life of the radionuclide assayed, a direct comparison between results from both laboratories was excluded and a comparison of experimental efficiencies of similar NaI detectors was used instead.
authors.affiliation: Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Roteta
authors.forename: Virginia
authors.initials: V
authors.lastname: Peyres
authors.forename: Leonor
authors.initials: L
authors.lastname: Rodríguez Barquero
authors.forename: Eduardo
authors.initials: E
authors.lastname: García-Toraño
authors.forename: Pablo
authors.initials: P
authors.lastname: Arenillas
authors.forename: Christian
authors.initials: C
authors.lastname: Balpardo
authors.forename: Darío
authors.initials: D
authors.lastname: Rodrígues
authors.forename: Roberto
authors.initials: R
authors.lastname: Llovera
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005710:Gallium Radioisotopes / Q000032:analysis / Q000737:chemistry* / Q000592:standards*; D006207:Half-Life; D038622:Internationality; D011829:Radiation Dosage; D012015:Reference Standards; D012016:Reference Values; D012588:Scintillation Counting / Q000295:instrumentation* / Q000592:standards*
chemical_list: D005710:Gallium Radioisotopes