A Long and Slender Position-Sensitive Helium-3 Proportional Counter with an Anode Wire Supported by a Ladder-Shaped Solid Insulator.

• URITANI Akira

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• KUNIYA Yutaka

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• TAKENAKA Yasuto

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• TOYOKAWA Hiroyuki

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• YAMANE Yoshihiro

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• MORI Chizuo

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• KOBAYASHI Keiji

  Research Reactor Institute, Kyoto University

• SHIROYA Seiji

  Research Reactor Institute, Kyoto University

• ICHIHARA Chihiro

  Research Reactor Institute, Kyoto University

Abstract

A long and slender position-sensitive 3He proportional counter with an outer diameter of 8mm and an effective length of 1.2m has been developed to measure neutron flux distributions in a critical assembly. Because it is difficult to make such a long and slender counter of con- ventional structure where an anode wire is stretched at the center of a cylindrical cathode tube, three prototype electrode systems of which anode wires are supported by insulator plates have been proposed. Among these three electrode systems, the electrode system of which anode wire is stuck on a ladder-shaped insulator has been adopted. The neutron flux distributions in the core of the Kyoto University Critical Assembly (KUCA) have been measured with the counter. Some non-uniformity of the detection efficiency has been observed throughout the counter. This non-uniformity has been corrected by calibrating the position-dependent detection efficiency with a gold wire activation method. A fairly satisfactory distribution, where the relative deviation from the gold wire activation method is 5.0%, has been obtained. Though the non-uniformity of the detection efficiency should be solved for precise measurements, the counter can be used for quick and rough measurements of neutron flux distributions.

Journal

• Journal of Nuclear Science and Technology

  Journal of Nuclear Science and Technology 32 (8), 719-726, 1995

  Atomic Energy Society of Japan

Keywords

• position-sensitive proportional counter
• helium 3
• ladder-shaped insulator
• long and slender counter
• critical assembly
• neutrons
• neutron flux distribution
• measuring methods
• performance

Details

• CRID: 1390282679070470016
• NII Article ID: 10002072866
• NII Book ID: AA00703720
• DOI: 10.3327/jnst.32.719
• COI: 1:CAS:528:DyaK2MXotFOktbc%3D
• ISSN: 18811248
• ISSN: 00223131
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed