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Fast nuclide recognition method based on feature transformation and neural network

A neural network and feature transformation technology, applied in the field of nuclide identification, can solve the problems of long training time, large number of input layers, high computer performance requirements, and achieve the effect of fast response speed and low radiation and noise interference.

Inactive Publication Date: 2017-08-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, full-spectrum input has disadvantages such as large data redundancy, large number of input layers, long training time, and high requirements for computer performance.

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  • Fast nuclide recognition method based on feature transformation and neural network
  • Fast nuclide recognition method based on feature transformation and neural network
  • Fast nuclide recognition method based on feature transformation and neural network

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0027] As shown in the figure, a fast nuclide identification method based on feature transformation and neural network of the present invention is characterized in that it comprises the following steps:

[0028] Step 1: Measure natural background spectrum and radionuclide spectrum by gamma detector;

[0029] Step 2: Use the filtering algorithm to smooth the natural background spectrum to obtain the standard background spectrum; use the filtering algorithm to smooth the radionuclide spectrum to obtain the standard radionuclide spectrum; since the measured energy spectrum contains the effect of noise, especially However, the natural background energy spectrum has strong statistical fluctuations, so filtering technolog...

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Abstract

The invention discloses a fast nuclide recognition method based on feature transformation and a neural network. The method comprises the steps that a gamma detector is used to measure a natural background spectrum and a radionuclide spectrum; a filtering algorithm is used to smooth the natural background spectrum to acquire a standard background spectrum; the filtering algorithm is used to smooth the radionuclide spectrum to acquire a standard radionuclide spectrum; the standard background spectrum is subtracted from the standard radionuclide spectrum to acquire a net quantization spectrum; eigentransformation is carried out on the net quantization spectrum; a certain number of transform coefficients are sequentially extracted as energy spectrum feature vectors and are normalized; and the normalized feature vectors are input into the neural network for nuclide recognition. The nuclide recognition method provided by the invention is not affected by the measurement time, the detection distance and the nuclide activity, has the advantages of fast response speed, natural background radiation, small noise interference and the like, and can be used for rapid nuclide recognition of a portable radiation detector.

Description

technical field [0001] The invention relates to a nuclide identification method, in particular to a fast nuclide identification method based on feature transformation and neural network. Background technique [0002] In a short period of time, no matter whether it is a crystal with a large size or a high detection efficiency, no clearly distinguishable nuclide characteristic peaks can be formed, so the nuclide identification algorithm based on the peak-seeking theory is not suitable for the rapid nuclide identification task. With the rapid increase of computer computing speed and the development of neural network, people consider using the full spectrum as a feature vector and inputting it into the neural network for nuclide identification. However, full-spectrum input has disadvantages such as large data redundancy, large number of input layers, long training time, and high requirements for computer performance. Contents of the invention [0003] The technical problem to...

Claims

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Application Information

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IPC IPC(8): G01T1/38G06K9/00G06K9/62G06N3/08
CPCG06N3/08G01T1/38G06F2218/04G06F2218/08G06F2218/12G06F18/2193G06F18/214
Inventor 汤晓斌何建平王鹏龚频韩镇阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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