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A New Method to Determine the Neutron Sensitivity of a Micro Fission Chamber for a Boiling Water Reactor

Atsushi Kimura, Kaoru Fujita, Masaharu Nakazawa, Shinya Fujita, Eiji Seki, Yutaka Tanaka, Shigehiro Kono

Nuclear Technology

Volume 136 / Number 2 / November 2001 / Pages 197-203


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A new method to determine neutron sensitivity of uranium-type local power range monitors (LPRMs) has been developed. In this method, neutron sensitivity of LPRMs is obtained from alpha-ray current of 234U. The uncertainty of the calibration for neutron sensitivity using alpha-ray current was 2.1%, and the correlation coefficient of these neutron sensitivities was 0.868 (sample: 50 cases). Using this method, the neutron sensitivity can be obtained without irradiation tests of LPRMs in reactors.

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