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[en] We studied the application of 241Am-Li interrogation neutron sources, which were originally deployed in non-destructive assay apparatus for nuclear safeguard, to calibration work. To determine the emission rate, the angular distribution of neutron fluence was measured using a a portable long counter. On the measurement day (October 23, 2015), the emission rate was determined to be 1.00 × 106 n/s. The expanded measurement uncertainty of the emission rate was 4.1% at the coverage factor k = 2. The mean energy of neutron spectrum was 0.41 MeV based on a Bonner multi-sphere spectrometer. The ambient dose equivalent rate at 1.0 m was evaluated to be 7.5 μSv/h. (author)
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Kanno, Ikuo (ed.) (Kyoto University, Kyoto (Japan)); [256 p.]; ISBN 978-4-89027-134-4; 
; 2019; p. 011020.1-011020.6; ISRD2018: 2. international symposium on radiation detectors and their uses; Tsukuba, Ibaraki (Japan); 23-26 Jan 2018; Available from https://doi.org/10.7566/JPSCP.24.011020; 12 refs., 5 figs., 1 tab.
; 2019; p. 011020.1-011020.6; ISRD2018: 2. international symposium on radiation detectors and their uses; Tsukuba, Ibaraki (Japan); 23-26 Jan 2018; Available from https://doi.org/10.7566/JPSCP.24.011020; 12 refs., 5 figs., 1 tab.