Evaluation of absolute measurement using a 4π plastic scintillator for the 4πβ-γ coincidence counting method

Y Unno; T Sanami; S Sasaki; M Hagiwara; A Yunoki

doi:10.1016/j.apradiso.2017.10.029

Evaluation of absolute measurement using a 4π plastic scintillator for the 4πβ-γ coincidence counting method

Appl Radiat Isot. 2018 Apr:134:302-306. doi: 10.1016/j.apradiso.2017.10.029. Epub 2017 Oct 16.

Authors

Y Unno¹, T Sanami², S Sasaki², M Hagiwara², A Yunoki³

Affiliations

¹ National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. Electronic address: y.unno@aist.go.jp.
² High energy accelerator research organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
³ National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.

PMID: 29102161
DOI: 10.1016/j.apradiso.2017.10.029

Abstract

Absolute measurement by the 4πβ-γ coincidence counting method was conducted by two photomultipliers facing across a plastic scintillator to be focused on β ray counting efficiency. The detector was held with a through-hole-type NaI(Tl) detector. The results include absolutely determined activity and its uncertainty especially about extrapolation. A comparison between the obtained and known activities showed agreement within their uncertainties.

Keywords: 4πβ-γ coincidence counting method; Absolute activity measurement; Accuracy; Co-60; Cs-134; Extrapolation; Scintillation detector; Uncertainty.