title: Standardization of 99mTc and 99Mo by the use of a 4pibeta-4pigamma counter.
abstract: Technetium-99m is widely used for many diagnostic investigations in nuclear medicine, thus the standardization of this nuclide is important. In classical 4pibeta-gamma coincidence counting of (99m)Tc, the steep slope of the efficiency function and the large extrapolation range may cause a large measurement uncertainty. In order to overcome these difficulties, we apply the 4pibeta+4pigamma sum counting technique for the standardization. Furthermore, we adopt both the 4pibeta-4pigamma coincidence counting method and the 4pibeta+4pigamma sum counting technique for the standardization of its parent nuclide (99)Mo. High efficiencies for both nuclides were easily achieved by the use of our 4pibeta-4pigamma counter. All the results were consistent with the reference value obtained by the conventional method obtained by NMIJ.
authors.affiliation: Japan Radioisotope Association, Bunkyo, Tokyo, Japan. tyamada@jrias.or.jp
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: Y
authors.initials: Y
authors.lastname: Sato
authors.forename: Y
authors.initials: Y
authors.lastname: Unno
authors.forename: A
authors.initials: A
authors.lastname: Yunoki
authors.forename: Y
authors.initials: Y
authors.lastname: Hino
authors.forename: K
authors.initials: K
authors.lastname: Ishii
mesh_terms: D008722:Methods; D008982:Molybdenum / Q000032:analysis / Q000592:standards*; D011868:Radioisotopes / Q000032:analysis / Q000592:standards; D012015:Reference Standards; D012588:Scintillation Counting / Q000379:methods*; D013667:Technetium / Q000032:analysis / Q000592:standards*
chemical_list: D011868:Radioisotopes; D013667:Technetium; D008982:Molybdenum