# US 11,029,417 B2 · Radioactivity measurement method and radioactivity measurement system using data expansion

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- Number: US 11,029,417 B2
- Document ID: US11029417B2
- Status: Granted
- Kind: B2
- Application number: 16/475,048
- Filed: 2018-01-02
- Published: 2019-10-31
- Granted: 2021-06-08
- Earliest claimed: 2017-01-02
- Assignees: Korea Hydro & Nuclear Power Co., Ltd.
- Applicants: Korea Hydro & Nuclear Power Co., Ltd
- Inventors: Seung Chan Lee; Je Joong Sung; Duk Joo Yoon; Sang Jun Ha
- Web page: https://patentgrep.com/patent/US11029417B2

## CPC

- G01T 1/16: Measuring radiation intensity (G01T1/29 takes precedence {; self-powered detectors G01T3/006; using an ionisation chamber filled with a liquid or solid, e.g. frozen liquid, dielectric G01T3/008})
- G01T 1/1663: {Processing methods of scan data, e.g. involving contrast enhancement, background reduction, smoothing, motion correction, dual radio-isotope scanning, computer processing (for measuring spatial distribution of radiation G01T1/2992; general purpose image data processing G06T1/00; computerized tomography G06T12/00); Ancillary equipment}
- G01T 1/2914: {Measurement of spatial distribution of radiation}
- G01T 1/36: Measuring spectral distribution of X-rays or of nuclear radiation {spectrometry (pulse selection circuits per se H03K; investigation of materials by radiation diffraction G01N23/20; spectrometer tubes H01J49/00)}
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

The present invention relates to a radioactivity measurement method and a radioactivity measurement system using data expansion. A radioactivity measurement method using data expansion according to the present invention comprises the steps of: measuring radioactivity while performing energy scanning and temporal scanning; preparing a database from a time-energy-related data set obtained in result of the scanning; expanding the database by means of random distribution fitting; and obtaining a radioactivity measurement value of desired time from the database.

## Claims

### Claim 1

A radioactivity measurement method using extended data, the method comprising:
measuring radioactivity while performing energy scanning and time scanning;
generating database from data sets about time-energy relationships obtained from the time scanning and energy scanning during a first time period;
extending the database using random distribution fitting over the first time period to obtain an extended database; and
estimating, from the extended database, a nuclide-based radioactivity decay characteristic for a second time period after the first period time.

### Claim 2 (depends on 1)

The radioactivity measurement method of claim 1, wherein the random distribution fitting includes fitting to a Poisson distribution.

### Claim 3 (depends on 1)

The radioactivity measurement method of claim 1, wherein obtaining the radioactivity measurement value includes using a data random extraction technique.

### Claim 4 (depends on 3)

The radioactivity measurement method of claim 3, wherein the data random extraction technique includes a Monte Carlo technique.

### Claim 5 (depends on 1)

The radioactivity measurement method of claim 1, wherein the energy scanning is performed in a state in which a measurement energy range is divided into a plurality of energy bands having the same band width.

### Claim 6 (depends on 5)

The radioactivity measurement method of claim 5, wherein the time scanning is performed to count a number of times of radioactivity decays on a predetermined time duration basis and on each energy band basis.

### Claim 7 (depends on 1)

The radioactivity measurement method of claim 1, wherein the data sets constituting the extended database include 3,000 to 6,000 data sets.