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Appl Radiat Isot. 2016 Mar;109:341-344. doi: 10.1016/j.apradiso.2015.11.104. Epub 2015 Dec 2.

Standardization of the radionuclides (60)Co and (59)Fe by digital 4πβ(PC)-γ(NaI) coincidence counting.

Author information

1
National Institute of Metrology, Beijing 100029, PR China. Electronic address: zhming@nim.ac.cn.
2
China Institute of Atomic Energy, Beijing 102413, PR China.
3
National Institute of Metrology, Beijing 100029, PR China.

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.

KEYWORDS:

Digital coincidence counting; International comparison; Radionuclide metrology

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