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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: 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.

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.


Segment of an unknown signal, shown in bold red, to be used in our discrimination method
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Fig15: Segment of an unknown signal, shown in bold red, to be used in our discrimination method

Mentions: The trailing edge of the neutron signal has higher rise time than that of the photon signal. However, this difference is not large enough to be exploited by directly applying signal processing techniques. In this Section, we introduce a discrimination method based on the frequency-domain data. We apply FFT (fast Fourier transform) only to a short segment of a normalized unknown pulse which is different between neutrons and photons (Fig.  15); the two ends of this segment are determined by adding two constant amounts of time to the point when a specified level on the leading edge is reached. Determination of a specified level on the leading edge as the starting point is arbitrary because the two leading edges of neutrons and photons are almost the same. Some training pulses are used to find the two constant amounts of time after the starting point within which the differing segments of neutrons and photons exist. In the experiments we carried out, this segment fell on the trailing edge from about 2–40 % of peak-amplitude, on average. However, changing these boundaries will not have a significant effect on the result. Given this segment, the following steps are taken:


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)

Segment of an unknown signal, shown in bold red, to be used in our discrimination method
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig15: Segment of an unknown signal, shown in bold red, to be used in our discrimination method
Mentions: The trailing edge of the neutron signal has higher rise time than that of the photon signal. However, this difference is not large enough to be exploited by directly applying signal processing techniques. In this Section, we introduce a discrimination method based on the frequency-domain data. We apply FFT (fast Fourier transform) only to a short segment of a normalized unknown pulse which is different between neutrons and photons (Fig.  15); the two ends of this segment are determined by adding two constant amounts of time to the point when a specified level on the leading edge is reached. Determination of a specified level on the leading edge as the starting point is arbitrary because the two leading edges of neutrons and photons are almost the same. Some training pulses are used to find the two constant amounts of time after the starting point within which the differing segments of neutrons and photons exist. In the experiments we carried out, this segment fell on the trailing edge from about 2–40 % of peak-amplitude, on average. However, changing these boundaries will not have a significant effect on the result. Given this segment, the following steps are taken:

Bottom Line: 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.

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.