A New 4.PI..BETA. Counter Operated at Atmospheric Pressure of CF4 Gas for the Computer Discrimination Method.

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概要

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• 4πβ-γ coincidence counting using a 4πβ pressurized proportional counter combined with the computer discrimination method has made it possible to determine the disintegration rate precisely and rapidly. Recently, measurement of short half-life nuclide requires further shortening of the gas replacement time, and we proposed to use atmospheric CF<SUB>4</SUB> gas instead of pressurized Ar 90%-CH<SUB>4</SUB> 10% mixture. However, a conventional 4πβ counter with CF<SUB>4</SUB> gas at atmospheric pressure gave unsatisfactory results ; small slopes of coincidence efficiency functions and low detection efficiencies for electron-capture decay nuclides. In order to resolve these problems, we constructed a new 4πβ counter with large volume and multianodes. Good plateau characteristics and good time relation between β and γ pulses were obtained in spite of large volume, and the slopes of coincidence efficiency functions and the detection efficiencies were improved. Use of this counter made it possible to measure short half-life nuclides and also easy to measure usual nuclides.

• 一般社団法人 日本原子力学会の論文

著者

• Miyahara Hiroshi

  Department Of Intelligent Machinery And Systems Kyushu University

• Mori Chizuo

  Department Of Electricity Aichi Institute Of Technology

• Noguchi Takuya

  Department of Chemistry, The University of Tokyo, Tokyo 113-0033, Japan

• MORI Chizuo

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• MATUMOTO Hiroki

  Department of Nuclear Engineering, School of Engineering, Nagoya University

• MIYAHARA Hiroshi

  Department of Nuclear Engineering, School of Engineering, Nagoya University

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