Application of multiple γ-ray detection to long-lived radioactive nuclide determination in environmental samples

Masumi Oshima, Jun Goto, Tomoko Haraga, Tadahiro Kin, Yurie Ikebe, Hirofumi Seto, Shigeru Bamba, Hirofumi Shinohara, Takao Morimoto, Keisuke Isogai

Research output: Contribution to journalArticlepeer-review


Gamma-gamma coincidence measurement utilized in γ-ray spectroscopy experiments is well known to be effective for the improvement of signal-to-noise ratio in a γ-ray spectrum. We study its applicability to the determination of long-lived radioactive nuclides in environmental samples. The γ-ray simulation code Geant 4.10.2 was used. A conventional and effective detector system comprising five Ge detectors was assumed. We took up 38 nuclides which need to be determined for the evaluation of fission product leakage at the nuclear accident in the Fukushima nuclear power plants in Japan. Among them 12 nuclides emit γ-rays and five nuclides of 60Co, 94Nb, 134Cs, 152Eu, and 154Eu can be the objectives of the multiple γ-ray detection methods. The simulation results indicate that the signal-to-noise ratio can be improved by a factor between 9.84 and 283, and the detection limit by a factor between 2.71 and 8.53 relative to the singles measurement, implying that the method can be well applied to the determination of the long-lived radioactive nuclides and will provide a quick and non-destructive analysis method.

Original languageEnglish
Pages (from-to)663-670
Number of pages8
Journaljournal of nuclear science and technology
Issue number6
Publication statusPublished - Jun 2 2020

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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