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Activity determination of (41)Ar using efficiency extrapolation method and 4πβ(PS)-4πγ(NaI) coincidence system.

Feng Xie1, Xuesong Li1, Yihua Dai1

  • 1Northwest Institute of Nuclear Technology, PO Box 69-14, Xi'an 710024, PR China.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 22, 2014
PubMed
Summary

Accurate measurement of Argon-41 (41Ar) activity was achieved using an efficiency extrapolation method. This technique, validated by high-resolution gamma spectroscopy, offers a reliable approach for quantifying radioactive noble gases.

Keywords:
4πβ–4πγ coincidence systemArgon-41Efficiency extrapolation methodHPGe detector

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Area of Science:

  • Nuclear Physics
  • Radiochemistry
  • Metrology

Background:

  • Accurate quantification of radioactive isotopes like Argon-41 (41Ar) is crucial for various applications, including environmental monitoring and nuclear safety.
  • Traditional methods may face challenges in efficiency calibration for complex decay schemes.

Purpose of the Study:

  • To demonstrate the efficacy of an efficiency extrapolation method for determining the activity of Argon-41 (41Ar).
  • To validate the efficiency extrapolation method against high-resolution gamma spectroscopy.

Main Methods:

  • Utilized a 4πβ-4πγ coincidence system employing NaI(Tl) and plastic scintillator (PS) detectors for gamma- and beta-ray detection, respectively.
  • Employed an efficiency extrapolation method by electronically varying beta detector efficiency via custom Visual Basic software.
  • Performed high-resolution gamma spectroscopy using a High-Purity Germanium (HPGe) detector for comparative analysis.

Main Results:

  • The activity of 41Ar was successfully determined using the efficiency extrapolation method.
  • Results obtained from the efficiency extrapolation method showed satisfactory agreement with those from high-resolution gamma spectroscopy.
  • The study confirmed the accuracy and reliability of the efficiency extrapolation method for 41Ar activity measurement.

Conclusions:

  • The efficiency extrapolation method provides an accurate and reliable means for measuring the activity of Argon-41 (41Ar).
  • This method serves as a viable alternative or complementary technique to high-resolution gamma spectroscopy for radioactive noble gas quantification.