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Digital discrimination of neutrons and gamma-rays in organic scintillation detectors using moment analysis
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10.1063/1.4754633
/content/aip/journal/rsi/83/9/10.1063/1.4754633
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4754633
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the experimental setup. The detector is exposed to different mixed radiation fields.

Image of FIG. 2.
FIG. 2.

Demonstration of the principle of moment analysis with averaged neutron and gamma-ray signal from an Am/Be isotropic neutron source. (a) Averaged neutron and gamma-ray signal from 20 000 neutron events and 20 000 gamma-ray events recorded by stilbene crystal detector. (b) Corresponding integrated spectra of averaged signals. (c) The first and second moment of the integrated spectra, and the chosen time interval is indicated in (a); clear difference could be found between neutron and gamma-ray signals.

Image of FIG. 3.
FIG. 3.

Plot of m 1 versus m 2 for neutron and gamma-ray signals acquired from Am/Be isotropic neutron source. A straight line has been used to distinguish neutrons from gamma-rays, on which the projection of each event is calculated and used as the discrimination criterion.

Image of FIG. 4.
FIG. 4.

Plot of projection versus E ee for neutron and gamma-ray signals acquired from Am/Be isotropic neutron source. The cutoff line which divides neutrons from gamma rays is indicated in the figure.

Image of FIG. 5.
FIG. 5.

The 1-D plot of projections for neutron and gamma-ray signals acquired with Am/Be isotropic neutron source. Two Gaussian curves corresponding to neutrons (dashed-dotted) and gamma-rays (dashed) are obtained by fitting the experimental data (point).

Image of FIG. 6.
FIG. 6.

Plot of TOF versus projection for neutron and gamma-ray signals acquired from an accelerator neutron source produced by D(d, n)3He reaction. Three plumes corresponding to gamma-ray peak (A), 2.5 MeV neutrons (B) as well as gamma-rays induced by inelastic scattered neutrons (C) are indicated in the figure.

Image of FIG. 7.
FIG. 7.

The 1-D plot of projections for neutron and gamma-ray signals acquired from an accelerator neutron source produced by the D(d, n)3He reaction. Two Gaussian curves corresponding to neutrons (dashed-dotted) and gamma-rays (dashed) are obtained by fitting the experimental data (point).

Image of FIG. 8.
FIG. 8.

Plot of TOF versus projection for neutron and gamma-ray signals acquired with an accelerator neutron source produced by T(p, n)3He reaction. Three plumes corresponding to gamma-ray peak (A), 2.5 MeV neutrons (B) as well as gamma-rays induced by inelastic scattered neutrons (C) are indicated in the figure.

Image of FIG. 9.
FIG. 9.

The 1-D plot of projections for neutron and gamma-ray signals acquired with an accelerator neutron source produced by the T(p, n)3He reaction. Two Gaussian curves corresponding to neutrons (dashed-dotted) and gamma-rays (dashed) are obtained by fitting the experimental data (point).

Image of FIG. 10.
FIG. 10.

Schematic diagram of the experimental setup on the HL-2A tokamak. The detector in the shielding (right) is about 4 m away from the main axis of tokamak torus (left). The structure of the shielding is indicated in the figure.

Image of FIG. 11.
FIG. 11.

Time trace of Ip, ne, NBI power, neutron and gamma-ray count rate during HL-2A plasma discharge #19273.

Image of FIG. 12.
FIG. 12.

Plot of projection versus E ee for neutron and gamma-ray events acquired from HL-2A plasma discharge #19273. The cutoff line which divides neutrons from gamma-rays is indicated in the figure.

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/content/aip/journal/rsi/83/9/10.1063/1.4754633
2012-09-26
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Digital discrimination of neutrons and gamma-rays in organic scintillation detectors using moment analysis
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/9/10.1063/1.4754633
10.1063/1.4754633
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