RADIOACTIVITY MEASUREMENT METHOD AND RADIOACTIVITY MEASUREMENT SYSTEM USING DATA EXPANSION

• US 20190331804A1
• Filed: 01/02/2018
• Published: 10/31/2019
• Est. Priority Date: 01/02/2017
• Status: Active Grant

• Current Assignee: Korea Hydro and Nuclear Power Company Limited (Government of South Korea)
• Original Assignee: Korea Hydro and Nuclear Power Company Limited (Government of South Korea)
• Inventors: LEE, Seung Chan, SUNG, Je Joong, YOON, Duk Joo, HA, Sang Jun
• Granted Patent: US 11,029,417 B2
• Time in Patent Office: Days
• CPC Class Codes: 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
• CPC Class Codes: 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 G06T11/003; Ancillary equipment colour printers G01T1/1666
• CPC Class Codes: G01T 1/2914 Measurement of spatial distribution of radiation
• CPC Class Codes: 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

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

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;

extending the database using random distribution fitting; and

obtaining, from the database, a radioactivity measurement value at a desired time.

2. The radioactivity measurement method of claim 1, wherein the random distribution fitting includes fitting to a Poisson distribution, wherein obtaining the radioactivity measurement value includes using the extended database to obtain the radioactivity measurement value.

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

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

5. 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.

6. 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.

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

8. A radioactivity measurement method comprising:

measuring a nuclide-based radioactivity decay characteristic at each of a plurality of times during a first time period, thereby to form database;

extending the database using random distribution fitting; and

using the extended database to estimate a nuclide-based radioactivity decay characteristic for a second time period after the first period time.

9. The radioactivity measurement method of claim 8, wherein the random distribution fitting includes fitting to a Poisson distribution, wherein obtaining the radioactivity measurement value includes using the extended database to obtain the radioactivity measurement value.

10. A radioactivity measurement system comprising:

a radioactivity measuring unit;

a scanning unit configured for performing energy scanning and time scanning in association with the radioactivity measuring unit;

a database unit configured for generating database from data sets about time-energy relationships obtained from the scanning unit;

a random distribution fitting unit configured for extending the database using Poisson distribution fitting; and

an extraction unit configured for extracting a radioactivity measurement value at a desired time using the extended database from the database unit.

11. The radioactivity measurement system of claim 10, wherein the extraction unit uses a data random extraction technique to extract the radioactivity measurement value.

12. The radioactivity measurement system of claim 10, wherein the data random extraction technique includes a Monte Carlo technique.

13. The radioactivity measurement system of claim 10, 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.

14. The radioactivity measurement system of claim 10, 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.

15. The radioactivity measurement system of claim 10, wherein the data sets constituting the extended database include 3,000 to 6,000 data sets.