NEUTRON MEASUREMENT APPARATUS, NEUTRON CALCULATION APPARATUS, AND NEUTRON MEASUREMENT METHOD

PROBLEM TO BE SOLVED: To measure neutrons after making measurements by a neutron detector and a gamma ray detector separately.SOLUTION: According to an embodiment, a neutron measurement apparatus 100 has: a neutron detector 1; a gamma ray detector 2; a neutron detector signal processing unit 10 which receives signals from the neutron detector 1 in sequence, performs Fourier transform on signals received for a predetermined period to generate neutron detector signal frequency data in the frequency domain, calculates a neutron detection signal power spectrum, and stores it; a gamma-ray detector signal processing unit 20 which receives signals from the gamma ray detector 2 in sequence, performs Fourier transform on signals received for a predetermined period to generate gamma ray detector signal frequency data in the frequency domain, calculates gamma ray detector signal power spectrum, and stores it; and a neutron calculation processing unit 30 which generates a neutron signal by removing a contribution equivalent to the gamma ray detector signal power spectrum from the neutron detector signal power spectrum.SELECTED DRAWING: Figure 1 【課題】中性子検出器とガンマ線検出器により別々に測定した後に、中性子を測定する。【解決手段】実施形態によれば、中性子測定装置１００は、中性子検出器１と、ガンマ線検出器２と、中性子検出器１からの信号を順次受け、所定期間の信号をフーリエ変換し周波数領域の中性子検出器信号周波数データを算出し中性子検出器信号パワースペクトルを演算して記憶する中性子検出器信号処理部１０と、ガンマ線検出器２からの信号を順次受け、所定期間の信号をフーリエ変換し周波数領域のガンマ線検出器信号周波数データを算出しガンマ線検出器信号パワースペクトルを演算して記憶するガンマ線検出器信号処理部２０と、中性子検出器信号パワースペクトルとガンマ線検出器信号パワースペクトルとに基づいて中性子検出器信号パワースペクトルからガンマ線検出器信号パワースペクトルに相当する寄与分を取り除き、中性子信号を算出する中性子演算処理部３０とを有する。【選択図】図１