title: Standardization of the radionuclides (60)Co and (59)Fe by digital 4πβ(PC)-γ(NaI) coincidence counting.
abstract: The digital coincidence counting (DCC) technique has been developed at NIM, China to replace the classical analog coincidence units in the 4πβ-γ counting system. The detector system comprises two NaI (Tl) γ-ray detectors and a 4πβ proportional counter (PC) operated with a mixture of argon and methane at atmospheric pressure in a gas flow arrangement. To update the activity results of radionuclide (60)Co in the KCDB and contribute to the APMP.RI(II)-K2.Fe-59 comparison, (60)Co and (59)Fe dry sources were prepared and measured using the digital 4πβ(PC)-γ(NaI) coincidence system by applying the efficiency extrapolation method. For (60)Co nuclide, the activity concentration value equal to 290.6kBqg(-1) with a relative standard uncertainty of 0.26%, is consistent with the result given by the calibrated ionization chamber. For the nuclide (59)Fe, the activity concentration value at the reference date was 471.7kBqg(-1) with a relative standard uncertainty of 0.34%. This value is in good agreement with the result obtained with the HPGe γ spectrometry, which was calibrated by using a series of standard point sources from PTB.
authors.affiliation: National Institute of Metrology, Beijing 100029, PR China. Electronic address: zhming@nim.ac.cn.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhang
authors.affiliation: China Institute of Atomic Energy, Beijing 102413, PR China.
authors.forename: Shunhe
authors.initials: S
authors.lastname: Yao
authors.affiliation: National Institute of Metrology, Beijing 100029, PR China.
authors.forename: Junchen
authors.initials: J
authors.lastname: Liang
authors.affiliation: National Institute of Metrology, Beijing 100029, PR China.
authors.forename: Haoran
authors.initials: H
authors.lastname: Liu
keywords: Digital coincidence counting; International comparison; Radionuclide metrology