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

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...

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Problems solved by technology

[0010] The attenuation method requires complex spectral analysis methods for later calculations, while the magnetic analysis method usually requires a large magnet, and the experimental setup is more complicated

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