Gamma nuclide identification method

An identification method and nuclide technology, which is applied in the field of gamma nuclide identification, can solve the problems of statistical error accumulation, isotope composition is difficult to be accurately analyzed, and the speed is slow

Active Publication Date: 2016-05-25
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

In the stripping method, due to the iterative stripping of a single nuclide, the statistical errors are accumulated in the iterations, making it difficult to accurately analyze the isotopic composition with low-energy γ characteristic peaks
The artificial neural network models used for nuclide identification include Bayesian network, optimal linear associative memory (OLAM) neural network, and BP artificial neur

Method used

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experiment example

[0083] According to the above steps, in this experiment example, the 22 Na, 137 Cs, 60 Co. 152 Eu, 241 Am, 68 The six standard sources of Ge work for the test samples.

[0084] Step 1: Energy Scale and FWHM Scale.

[0085] Measured by the CsI(Tl) probe high-resolution nuclide identification instrument developed by the Institute of High Energy Physics 22 Na, 137 Cs, 60 Co. 152 Eu, 241 Am, 68 The γ-ray energy spectrum of the six standard sources of Ge is scaled by energy and full width at half maximum, and the scale coefficients of the two are obtained.

[0086] The length of the energy spectrum data set is 1024, and the energy spectrum data set is composed of track address ch, ch=1, 2,..., 1024 or 2048 or 4096, ray energy E, ray count rate C, E=a+b×ch, a and b are constants, called energy scale coefficients. The method of solving the scale coefficient is: use two or more sets of known energies and track sites to establish an overdetermined linear equation system, a...

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Abstract

The invention provides a gamma nuclide fast identification method in a complex radiation field, comprising the following steps: measuring a radiation field to get a gamma energy spectrum; deducting a comprehensive background from the gamma energy spectrum and reducing the noise of the gamma energy spectrum to get a net energy spectrum; determining potential nuclides according to the peak positions in the net energy spectrum; calculating the total net peak area of each potential nuclide; standardizing the total net peak area of each potential nuclide to get the standardized total net peak area of the potential nuclide; deducting a Compton scattering background from the standardized total net peak area of each potential nuclide to get the pure peak area value of each potential nuclide; calculating the total probability value and the probability standard threshold of each potential nuclide in the radiation field; and calculating the existence probability of each potential nuclide. According to the invention, multiple times of background deduction calculation and standardization are performed on the measured energy spectrum data, and a nuclide can be identified and the existence probability of the nuclide can be calculated quickly based on the total probability value calculated based on the probability statistics principle and the standard threshold calculated by a standard source.

Description

technical field [0001] The invention relates to a method for identifying gamma nuclides, in particular to a method for rapidly identifying gamma nuclides in complex radiation fields. Background technique [0002] In nuclear power plant spent fuel or radioactive waste repositories and processing rooms, there are gamma radioactive nuclides of unknown type and intensity. In order to grasp the potential nuclide information in these environments, it is necessary to use The energy spectrum measurement of the marked gamma rays emitted by the source is carried out, and the measured energy spectrum is analyzed by the nuclide identification method to realize the qualitative judgment and quantitative analysis of the nuclides existing in the radiation field. [0003] The key point in the realization of the nuclide identification method is the effective analysis of the energy spectrum, and when measuring the gamma radioactivity in a complex radiation site, the background (including natur...

Claims

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Application Information

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IPC IPC(8): G01T1/38
Inventor 李哲魏龙王宝义刘双全张译文
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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