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Decomposition Method of Multiple Spectrum Peaks in Radioactivity Measurement

A radiometric, multiplexing technique used in the resolution of multiplex peaks

Inactive Publication Date: 2011-12-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This method overcomes the shortcomings of current overlapping peak decomposition methods

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  • Decomposition Method of Multiple Spectrum Peaks in Radioactivity Measurement
  • Decomposition Method of Multiple Spectrum Peaks in Radioactivity Measurement
  • Decomposition Method of Multiple Spectrum Peaks in Radioactivity Measurement

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Embodiment Construction

[0014] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0015] The present embodiment measures with NaI detector by 206 T1 spectral peak (583keV), 214 Bi spectrum peak (609keV), 137 Taking the overlapping peak formed by the three peaks of Cs spectrum peak (0.662MeV) as an example, it is decomposed, and corresponding experiments are carried out to verify the effectiveness of the present invention. Specific steps are as follows:

[0016] ① The radioactivity obtained by the 206 T1 spectral peak (583keV), 214 Bi spectrum peak (609keV), 137 The energy spectrum section (ch195-ch260) of the overlapping peak formed by the three peaks of t...

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Abstract

The invention discloses a method for decomposing multiple spectral peaks during radioactive measurement, and the method comprises the following steps: firstly, performing background rejection on an energy spectrum acquired from radioactive measurement, thereby acquiring a net count of overlapped peaks of a to-be-decomposed spectrum section; secondly, normalizing the acquired net count of the overlapped peaks, taking normalized data as a probability density function and generating a random number which complies with the distribution of the probability density function; thirdly, establishing aninitial Gaussian mixture model of the probability density function; and finally, performing iterative operation on the generated random number by adopting an expectation maximizing method till achieving convergence, updating parameters of the Gaussian mixture model and acquiring a final value, thereby finishing decomposing the overlapped peaks. The method is high in decomposing precision and is an effective method used for quantitative and qualitative analysis on radionuclide.

Description

technical field [0001] The invention relates to a method for decomposing multiple spectral peaks in radioactivity measurement. Background technique [0002] In the measurement of radioactive energy spectrum, the overlapping phenomenon of all-energy peaks often occurs, and the overlap of all-energy peaks is particularly serious in some low-energy segments. In order to extract relevant information, it is necessary to decompose overlapping peaks, and the precision of the decomposition directly affects the quantitative and even qualitative analysis of radionuclides. For example, the NaI(Tl) airborne gamma energy spectrometer does not have a high energy resolution for gamma rays. 238 in the U series 214 0.609MeV of Bi, 232 Th series 208 The 0.583MeV characteristic gamma rays of Tl and 137 0.662MeV of Cs, 134 The 0.605MeV γ-ray spectral peaks of Cs overlap together, resulting in 137 Cs and 134 The calculation of Cs activity concentration is inaccurate, sometimes due to too...

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Application Information

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IPC IPC(8): G01T1/36
Inventor 黄洪全方方王超阎萍王敏龚迪琛丁卫撑刘念聪周伟刘易
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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