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Comparing standard Bonner spheres and high-sensitivity Bonner cylinders.

Kuo-Wei Lee1, Ming-Chen Yuan2, Shiang-Huei Jiang3

  • 1Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan, ROC Institute of Nuclear Engineering and Science, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan, ROC.

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High-sensitivity Bonner cylinders offer a 17.9x efficiency boost for neutron detection compared to standard Bonner spheres. However, their non-symmetric geometry introduces angular dependence, requiring careful consideration during neutron spectrum unfolding.

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Area of Science:

  • Nuclear Instrumentation and Measurement
  • Radiation Detection Physics

Background:

  • Standard Bonner spheres are widely used for neutron spectrum unfolding.
  • There is a need for neutron detectors with higher sensitivity and efficiency.

Purpose of the Study:

  • To compare the performance of proposed high-sensitivity Bonner cylinders with standard Bonner spheres.
  • To evaluate response functions, detection efficiencies, and angular dependencies of both systems.
  • To assess their suitability for neutron spectrum unfolding applications.

Main Methods:

  • Calibration of Bonner spheres and Bonner cylinders using a Californium-252 neutron source.
  • Assembly of Bonner cylinders using a cylindrical Helium-3 (³He) tube and polyethylene (PE) moderators.
  • Inclusion of a lead layer in one PE cylinder to enhance high-energy neutron detection.
  • Systematic comparison through calculations and measurements.

Main Results:

  • Bonner cylinders demonstrated a ~17.9 times higher efficiency compared to Bonner spheres.
  • Bonner cylinders exhibited angular dependence due to their non-symmetric geometry.
  • Response functions and spectrum unfolding characteristics were systematically compared.

Conclusions:

  • Bonner cylinders offer significantly improved neutron detection efficiency.
  • The angular dependence of Bonner cylinders must be accounted for in neutron spectrum unfolding.
  • Bonner cylinders represent a promising advancement for neutron measurement applications.