Nuclear resonance fluorescence-based pulse gamma ray energy spectrum measuring system and method

A nuclear resonance fluorescence and measurement system technology, applied in the field of nuclear radiation ray energy spectrum measurement, can solve problems such as complex experimental setup, and achieve the effects of simple experimental setup, high measurement accuracy, and accurate energy point energy values.

Active Publication Date: 2018-07-10
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0010] The attenuation method requires complex spectral analysis methods for later calculations, while...

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  • Nuclear resonance fluorescence-based pulse gamma ray energy spectrum measuring system and method
  • Nuclear resonance fluorescence-based pulse gamma ray energy spectrum measuring system and method
  • Nuclear resonance fluorescence-based pulse gamma ray energy spectrum measuring system and method

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Embodiment Construction

[0040] The present invention is based on nuclear resonance fluorescence technology, utilizes different nuclide energy levels and measures the ray intensity of several specific energy points, thereby realizing the measurement of the gamma pulse ray energy spectrum, the measurement accuracy and the number of selected nuclide energy levels and The measurement accuracy of each energy point is related.

[0041] The principle approach is:

[0042] A specific target is placed at the front end of the pulsed γ-ray to be measured. The material of the specific target is selected according to the energy range of the pulsed γ-ray to be measured. Here, a method of superimposing multiple target materials is proposed. By selecting the specific energy level of a specific isotope to measure the ray intensity of the required energy point, care should be taken to ensure that the NRF cross section is appropriate when selecting the nuclide and that there is no interference from other energy levels in th...

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Abstract

The invention relates to a nuclear resonance fluorescence-based pulse gamma ray energy spectrum measuring system and method. The device comprises lead collimators, a HPGe detector and a specific target sheet; the lead collimators and the specific target sheet are sequentially disposed in the beam direction of pulse gamma rays to be measured; the HPGe detector is located to one side of the pulse gamma rays to be measured; and an included angle between the HPGe detector and the beam direction ranges from 90 degrees to 120 degrees; a plurality of target materials are stacked so as to form the specific target sheet; and the energy level of each target material is within the energy range of the pulse gamma rays to be measured. The method includes the following steps that: 1) a HPGe detector isadopted to detect the number R of photons emitted by the pulse gamma rays to be measured during nuclear resonance fluorescence; 2) photon density is calculated; and 3) and Gaussian fitting is performed on the basis of the photon density, so that the energy spectrum distribution diagram of the pulse gamma rays to be measured is obtained. With the method of the invention adopted, a pulse gamma ray energy spectrum measurement experiment is simple to set, later-stage calculation is simple, and measurement accuracy is high.

Description

Technical field [0001] The invention belongs to the nuclear radiation ray energy spectrum measurement technology, and specifically relates to a pulsed gamma ray energy spectrum measurement system and method based on nuclear resonance fluorescence. Background technique [0002] When the energy of the incident γ photon is equal to the energy level difference between the excited state and the ground state of the nucleus, the nucleus will produce strong resonance absorption, and then it will be in the excited state. The excited nucleus will be in the process of de-excited to the ground state or lower energy excited state. Release specific energy gamma photons, this process is nuclear resonance fluorescence (Nuclear Resonance Fluorescence, NRF). Due to the narrow bandwidth of the nuclear energy level, the released gamma photon bandwidth is very narrow (ΔE / E=10 -6 ). The reaction cross section of nuclear resonance fluorescence can be expressed as: [0003] [0004] Among them, E is the...

Claims

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Application Information

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IPC IPC(8): G01T1/36
CPCG01T1/36
Inventor 魏坤翁秀峰黑东炜盛亮李斌康谭新建付竹明孙彬
Owner NORTHWEST INST OF NUCLEAR TECH
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