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The ability to distinguish between neutrons and gamma-rays is important in the fast - neutron detection, especially when using the scintillation detector. A dual correlation pattern recognition (DCPR) method that was based on the correlation pattern recognition technique has been developed for classification of neutron/gamma events from a scintilla...
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... EJ301 detector consists of a liquid scintillator container (cell), photo-multiplier tube (PMT), voltage divider, cover shield and preamplifier. The cell is left cylinder made of aluminum with 34-mm diameter and 60-mm length in size. A diagram of the experimental setup is shown in Fig. 1. The EJ301 detector was operated with negative biases of 1200V. The signals from the anode of the PMT is digitized by a digital oscilloscope (Tektronix DPO7254C) with 2.5 GHz bandwidth, 11-bits resolution equivalent and at a sampling rate of 1 GSPS.A neutron 252 Cf source (11.6 mCi) and gamma-ray sources ( 22 Na, 137 Cs and 60 Co) were ...
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... distributions of PSDs are usually obtained in the form of a Gaussian, which Gaussian fits maybe applied. The figure of merit (FOM) was used to evaluate the quantitative results of neutron/gamma discrimination, which was defined by Eq. (6) [1, 4-8,10,12,13,15, 17,18]. The higher FOM value is, the better PSD performs. ...
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... tail to total integral ratio and the histogram on the Fig. 8 (b) was calculated for the PSD-parameter. The histograms of the DCPR method for 252 Cf and 60 Co sources are shown in Fig. 9 (a) and (b), respectively. The histogram in Fig. 9 (a) was fitted by the multi-peak Gaussian function and the FOM value was approximately 1.59. FOMs are shown in Fig. 10 as a function of energy thresholds. Each FOM value was calculated by the Gaussian fit in a dataset of 10,000 pulses for both the DCI method and the DCPR method. shows that the DCPR method is more segregated than the DCI method, especially the below 200 keVee energy region. Using a separate-threshold in the histogram in Fig. 9 (a) and ...
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... on the FOMs performances on Fig. 10, the DCPR method is better than the DCI method in the full-range survey. The DCPR method is increasing from 0.65 to 2.2 in the range of 30 -420 keVee and smoothly dropping from 2.2 to 1.6 in the range of 420 -1100 keVee, while the DCI method is continuously increased from 0.53 to 1.62 in range measured (50 -1100 keVee). The ratio of ...
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... the full-range survey. The DCPR method is increasing from 0.65 to 2.2 in the range of 30 -420 keVee and smoothly dropping from 2.2 to 1.6 in the range of 420 -1100 keVee, while the DCI method is continuously increased from 0.53 to 1.62 in range measured (50 -1100 keVee). The ratio of FOM values between the DCPR method and the DCI method is shown Fig. 11; it has been shown that the ability to distinguish between neutrons and gamma-rays of the DCPR method is clearly improved in the region below 1000 keVee. While most other neutron/gamma PSD methods obtained bad results in the low region, the DCPR method has been improved in this ...
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