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Development of portable long counter with two different moderator materials.

Y Tanimura¹, M Tsutsumi², M Yoshizawa²

¹Department of Radiation Protection, Nuclear Science and Research Institute, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Ibaraki 319-1195, Japan tanimura.yoshihiko@jaea.go.jp.

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|February 4, 2014

Summary

A new portable long counter (LC) was developed for neutron detection. This lightweight device offers a flat energy response, enhancing its utility in various applications.

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Area of Science:

Nuclear instrumentation
Neutron detection physics

Background:

Traditional neutron detectors can be bulky and lack a flat energy response.
Accurate neutron energy spectrum measurement is crucial for applications like nuclear safeguards and radiation protection.

Purpose of the Study:

To develop a portable, lightweight long counter (LC) with a broad and flat neutron energy response.
To improve sensitivity to low-energy neutrons using advanced moderator materials.

Main Methods:

Design and construction of a compact LC incorporating a Helium-3 (He-3) thermal neutron detector, moderator, and shielding.
Utilized polystyrene instead of polyethylene in the moderator to enhance low-energy neutron sensitivity.
Employed the MCNP (Monte Carlo N-Particle) code for response function calculations.
Validated simulation results through experiments using monoenergetic neutron calibration fields.

Main Results:

Successfully developed a portable LC with dimensions of 11 cm radius and 39 cm length, weighing 15 kg.
Achieved an almost flat response function for neutrons in the energy range of 0.4 eV to 5 MeV.
MCNP simulations showed good agreement with experimental data, confirming the detector's performance.

Conclusions:

The developed portable long counter meets design specifications for weight, size, and energy response.
The use of polystyrene effectively increased sensitivity to low-energy neutrons.
The validated design provides a reliable tool for neutron detection across a wide energy spectrum.