Method for analyzing alpha-ray spectrum obtained from radiation source

Patent metadata

Field	Value
Publication number	US-12523788-B2
Application number	US-202118260469-A
Country	US
Kind code	B2
Filing date	Dec 9, 2021
Priority date	Jan 29, 2021
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The present invention relates to a method for analyzing an alpha-ray spectrum obtained from a radiation source, wherein the radiation source includes a first nuclide and a second nuclide that are different from each other, the method comprising the steps of: obtaining simulated spectra for alpha rays emitted from the first nuclide and the second nuclide through a simulation using radioactivity functions of the first nuclide and the second nuclide; measuring alpha rays emitted from the radiation source to obtain an alpha-ray spectrum; and decomposing the alpha-ray spectrum into a first alpha-ray spectrum emitted from the first nuclide and a second alpha-ray spectrum emitted from the second nuclide, on the basis of the simulated spectra.

First claim

The invention claimed is:

1 . A method of analyzing an alpha ray spectrum obtained from a radiation source, wherein the radiation source includes a first nuclide and a second nuclide that are different from each other, comprising:
obtaining simulated spectra of alpha rays emitted from the first and second nuclides by a simulation based on radioactivity functions of the first and second nuclides; obtaining the alpha ray spectrum by measuring an alpha ray emitted from the radiation source; and decomposing the alpha ray spectrum into a first alpha ray spectrum for an alpha ray emitted from the first nuclide and a second alpha ray spectrum for an alpha ray emitted from the second nuclide based on the simulated spectra.

2 . The method of claim 1 , wherein the second nuclide is a daughter nuclide of the first nuclide.

3 . The method of claim 1 , wherein the combination of the first nuclide and the second nuclide is any one of the combinations of [ 225 Ac, 213 Bi], [ 211 At, 212 Po], [ 212 Bi, 212 Po], [ 213 Bi, 213 Po], [ 212 Pb, 212 Po], [ 223 Ra, 212 Bi], and [ 227 Th, 211 Bi].

4 . The method of claim 2 , wherein the radiation source includes a first radiation source and a second radiation source, and the first radiation source and the second radiation source have different distributions of the first nuclide and the second nuclide.

5 . The method of claim 4 , wherein, in the measurement, the first radiation source and the second radiation source are spaced apart from each other.

6 . The method of claim 5 , further comprising deriving, after the decomposition, a ratio of an alpha ray from the first radiation source and an alpha ray from the second radiation source at a specific position to be measured.

7 . The method of claim 1 , wherein the measurement is performed on a replica of a part of the body.

8 . The method of claim 1 , wherein the radioactivity functions are obtained based on information on the half-life and the probability of emission of the first nuclide and the second nuclide.

9 . The method of claim 1 , wherein the decomposition of a spectrum to be measured involves a step of obtaining a coefficient ratio between the first alpha ray spectrum and the second alpha ray spectrum at a specific position to be measured.

10 . A method of analyzing an alpha ray spectrum obtained from a radiation source, wherein the radiation source includes a first radiation source including a parent nuclide and a second radiation source that is spaced apart from the first radiation source and includes a daughter nuclide of the parent nuclide, comprising:
obtaining simulated spectra of alpha rays emitted from the parent nuclide and the daughter nuclide by a simulation based on radioactivity functions of the parent nuclide and the daughter nuclide; obtaining the alpha ray spectrum by measuring an alpha ray emitted from the radiation source; decomposing the alpha ray spectrum into a first alpha ray spectrum for an alpha ray emitted from the parent nuclide and a second alpha ray spectrum for an alpha ray emitted from the daughter nuclide based on the simulated spectra; and classifying alpha rays measured at a specific position into an alpha ray from the parent nuclide and an alpha ray from the daughter nuclide.

11 . The method of claim 10 , wherein the measurement is performed on a replica of a part of the body.

Assignees

• Korea Inst Radiological & Medical Sciences

Inventors

• Kim Gun A
• Kim Jong Guk
• Lim Il Han
• Kim Byoung Soo
• Song Kang Hyon

Classifications

• G01T1/167

  Measuring radioactive content of objects, e.g. contamination (whole body counters G01T1/163) · CPC title

• G01N23/2273

  Measuring photoelectron spectrum, e.g. electron spectroscopy for chemical analysis [ESCA] or X-ray photoelectron spectroscopy [XPS] · CPC title

• G01N23/2076

  for spectrometry, i.e. using an analysing crystal, e.g. for measuring X-ray fluorescence spectrum of a sample with wavelength-dispersion, i.e. WDXFS · CPC title

• G01T1/202

  the detector being a crystal · CPC title

• G01N23/207

  Diffractometry using detectors, e.g. using a probe in a central position and one or more displaceable detectors in circumferential positions · CPC title