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Quick algorithms for real-time discrimination of neutrons and gamma rays.

Amiri M, Přenosil V, Cvachovec F, Matěj Z, Mravec F - J Radioanal Nucl Chem (2014)

Bottom Line: The methods introduced discriminate neutrons and gamma rays successfully in the digital domain.They are mathematically simple and exploit samples during the life time of the pulse, hence appropriate for field measurements.All these methods are applied to a set of mixed neutron and photon signals from a stilbene scintillator and their discrimination qualities are compared.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Informatics, Masaryk University, Brno, Czech Republic.

ABSTRACT

Several new methods for the digital discrimination of neutrons and gamma-rays in a mixed radiation field are presented. The methods introduced discriminate neutrons and gamma rays successfully in the digital domain. They are mathematically simple and exploit samples during the life time of the pulse, hence appropriate for field measurements. All these methods are applied to a set of mixed neutron and photon signals from a stilbene scintillator and their discrimination qualities are compared.

No MeSH data available.


Neutron and photon signal segments, obtained under 8-bit resolution and 1 GS/s sampling rate, after mean of the windowed curve is subtracted from every point
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Fig17: Neutron and photon signal segments, obtained under 8-bit resolution and 1 GS/s sampling rate, after mean of the windowed curve is subtracted from every point

Mentions: In Step 2, the mean of curve is subtracted from every point after application of window, while typically this is performed before window application (for removal of DC spectral component). This will cause the left ends of the neutron and photon pulses get opposing amplitude signs, as Fig.  16 illustrates. Since the samples with lower indexes have higher frequencies, the different signs of neutrons and photons will create a mirror image of them in high frequency region of their spectra. Although this difference could be easily used for discrimination, mid-samples in Fig. 16, which contribute to the lower frequencies, have this property too. This difference is not always achievable: it depends on the resolution of the data, the length of the segment used, and the instrumentation settings. Figure 17 shows the result of the same approach applied to the data obtained with 8-bit resolution digitizer set at 1 GS/s sampling rate. Digital signal processing techniques almost fail to discriminate in such cases. In Sect.  6.3, we will introduce a general approach to resolve this issue.Fig. 16


Quick algorithms for real-time discrimination of neutrons and gamma rays.

Amiri M, Přenosil V, Cvachovec F, Matěj Z, Mravec F - J Radioanal Nucl Chem (2014)

Neutron and photon signal segments, obtained under 8-bit resolution and 1 GS/s sampling rate, after mean of the windowed curve is subtracted from every point
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514667&req=5

Fig17: Neutron and photon signal segments, obtained under 8-bit resolution and 1 GS/s sampling rate, after mean of the windowed curve is subtracted from every point
Mentions: In Step 2, the mean of curve is subtracted from every point after application of window, while typically this is performed before window application (for removal of DC spectral component). This will cause the left ends of the neutron and photon pulses get opposing amplitude signs, as Fig.  16 illustrates. Since the samples with lower indexes have higher frequencies, the different signs of neutrons and photons will create a mirror image of them in high frequency region of their spectra. Although this difference could be easily used for discrimination, mid-samples in Fig. 16, which contribute to the lower frequencies, have this property too. This difference is not always achievable: it depends on the resolution of the data, the length of the segment used, and the instrumentation settings. Figure 17 shows the result of the same approach applied to the data obtained with 8-bit resolution digitizer set at 1 GS/s sampling rate. Digital signal processing techniques almost fail to discriminate in such cases. In Sect.  6.3, we will introduce a general approach to resolve this issue.Fig. 16

Bottom Line: The methods introduced discriminate neutrons and gamma rays successfully in the digital domain.They are mathematically simple and exploit samples during the life time of the pulse, hence appropriate for field measurements.All these methods are applied to a set of mixed neutron and photon signals from a stilbene scintillator and their discrimination qualities are compared.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Informatics, Masaryk University, Brno, Czech Republic.

ABSTRACT

Several new methods for the digital discrimination of neutrons and gamma-rays in a mixed radiation field are presented. The methods introduced discriminate neutrons and gamma rays successfully in the digital domain. They are mathematically simple and exploit samples during the life time of the pulse, hence appropriate for field measurements. All these methods are applied to a set of mixed neutron and photon signals from a stilbene scintillator and their discrimination qualities are compared.

No MeSH data available.