Method for discriminating alpha/gamma mixed radiation field particles in real time based on digital waveform

Abstract

The invention belongs to the technical field of nuclear radiation measurement and particle measurement, and particularly relates to a method for discriminating alpha / gamma mixed radiation field particles in real time based on digital waveform. The real-time discrimination method comprises the following steps: anode signals of a CsI (Tl) detector are acquired, and are converted by a 100MSPS ADC into digital signals; the thresholds of the digital signals are judged, the signals meeting the threshold condition are processed in two data flows, one data flow is used for counting, and the other data flow is used for discrimination; waveform discrimination parameters are extracted, sent to a serial transmission module, and sent to an upper computer; and upper computer software receives the discrimination parameters and displays the two-dimensional distribution of the discrimination parameters and the alpha / gamma discrimination spectrum. The problems such as huge system and poor stability of a traditional discrimination method and low efficiency of a digital off-line discrimination method are solved. The method of the invention has the advantages of accurate and reliable algorithm, simple and portable system, real-time discrimination capability, and the like.

Description

technical field

[0001] The invention belongs to the technical field of nuclear radiation measurement and particle measurement, and can be used for real-time resolution of particles in alpha / gamma mixed radiation fields. Background technique

[0002] When α / γ rays are incident on the CsI(Tl) scintillation detector, the shapes of the photoelectric pulse signals formed are different. It has important applications in deep space exploration and nuclear reaction differential cross section measurement.

[0003] Traditional waveform screening is based on analog electronic technology, which requires special nuclear instrument plug-ins or microcomputer automatic measurement and control systems. Although real-time screening can be achieved, the instruments are complicated, the system is huge, the pulse count rate is low, the stability is poor, and the screening method is single. .

[0004] The development of digital technology has opened up a new space for waveform discrimination. Ba...

Examples

Embodiment Construction

[0039] Starting from the principles of the present invention, the method for real-time screening of α / γ mixed radiation field particles based on digital waveforms proposed by the present invention will be further introduced in conjunction with the accompanying drawings and embodiments:

[0040] CsI(Tl) is an inorganic scintillation crystal doped with thallium cesium iodide, with high density, high average atomic number, and emission spectrum peak between 540nm and 550nm. A CsI(Tl) crystal is coupled with a photomultiplier tube with matched spectral response to form a CsI(Tl) inorganic scintillation detector. When α and γ are incident on the CsI(Tl) detector, the ionization densities of the two particles in CsI(Tl) are different. When α particles are incident on the scintillator, the energy deposition density is relatively large, and the decay time of the excited fluorescence pulse is short; while when the gamma ray is incident, the energy deposition density is small, and the d...

technical field

[0001] The invention belongs to the technical field of nuclear radiation measurement and particle measurement, and can be used for real-time resolution of particles in alpha / gamma mixed radiation fields. Background technique

[0002] When α / γ rays are incident on the CsI(Tl) scintillation detector, the shapes of the photoelectric pulse signals formed are different. It has important applications in deep space exploration and nuclear reaction differential cross section measurement.

[0003] Traditional waveform screening is based on analog electronic technology, which requires special nuclear instrument plug-ins or microcomputer automatic measurement and control systems. Although real-time screening can be achieved, the instruments are complicated, the system is huge, the pulse count rate is low, the stability is poor, and the screening method is single. .

[0004] The development of digital technology has opened up a new space for waveform discrimination. Ba...

Examples

Embodiment Construction

[0039] Starting from the principles of the present invention, the method for real-time screening of α / γ mixed radiation field particles based on digital waveforms proposed by the present invention will be further introduced in conjunction with the accompanying drawings and embodiments:

[0040] CsI(Tl) is an inorganic scintillation crystal doped with thallium cesium iodide, with high density, high average atomic number, and emission spectrum peak between 540nm and 550nm. A CsI(Tl) crystal is coupled with a photomultiplier tube with matched spectral response to form a CsI(Tl) inorganic scintillation detector. When α and γ are incident on the CsI(Tl) detector, the ionization densities of the two particles in CsI(Tl) are different. When α particles are incident on the scintillator, the energy deposition density is relatively large, and the decay time of the excited fluorescence pulse is short; while when the gamma ray is incident, the energy deposition density is small, and the d...

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