title: Standardization method of ²²Na using two NaI(Tl) scintillation detectors.
abstract: A new standardization method for a sealed (22)Na point source was developed utilizing two NaI(Tl) scintillation detectors. In the proposed method, the count rates of annihilation radiation, gamma rays, their coincidence sum, and the coincidences between the two detectors are used. The equations from which the source activity can be deduced are derived in this work. A series of EGS-5 Monte Carlo calculations were conducted to test the validity of the expressions. The calculated activity agreed within approximately 1 percent with the literature data used as input in the simulations.
authors.affiliation: National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. Electronic address: yss.sato@aist.go.jp.
authors.forename: Y
authors.initials: Y
authors.lastname: Sato
authors.affiliation: National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan; Japan Radioisotope Association, 2-28-45 Hon-komagome, Bunkyo, Tokyo 113-8941, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.affiliation: Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
keywords: (22)Na; EGS5MPI; Monte Carlo simulation; Sealed point source; Standardization