EP0386687A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of measuring reduction of surface layer material and apparatus therefor
Assignee: Tonen General Sekiyu KK
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Filing: 1990-03-06
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Granted: —
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Expires: 2010-03-06
Abstract
Abstract A method in which a surface layer material whose amount of reduction is to be measured is activated to find a distribution ratio of two or more kinds of radioactive nuclides that are produced in the space in the surface layer of the material, and the distribution ratio is used as an index for the amount of reduction of surface layer material. The amount of reduction in the surface layer material is measured in situ, nondestructively, easily and irrespectively of obstacles and the distance that exist between the detector and the material that is to be measured.
Inventors
- 👤 Toshiso Kosako
- 👤 Kazuo Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 06:42
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/22; G01N23/221; G01N23/222; G01N2223/00; G01N2223/01; G01N2223/07; G01N2223/074; G01N2223/0745; G01N2223/30; G01N2223/303; G01N2223/60; G01N2223/634
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A method of measuring reduction of surface layer material wherein the reduction of the surface layer material is substituted for a change in the radioactivity in the surface layer of the material activated by neutrons or charged particles to measure the residual radioactivity in the surface layer of the material or to measure the radioactivity of the material that is removed from the surface layer and is trapped by a filter, characterized in that a distribution ratio of two or more kinds of radioactive nuclides produced by the activation reaction is found in the space of the surface layer of said material and is used as an index for the reduction.
Claim 2
Independent Claim
111 words
A method of measuring reduction of surface layer material wherein the reduction of the surface layer material is substituted for a change in the radioactivity in the surface layer of the material activated by neutrons or charged particles to measure the residual radioactivity in the surface layer of the material or to measure the radioactivity of the material that is removed from the surface layer and is trapped by a filter, characterized in that a distribution ratio of two or more kinds of radioactive nuclides produced by the activation reaction is found in the space of the surface layer of said material and is used as an index for the reduction.
Claim 3
Dependent Claim
23 words
A method of measuring reduction of the surface layer material according to claim 1, wherein said radioactive nuclides are ⁵⁶Co, ⁵⁷Co and ⁵⁸Co.
Claim 4
Dependent Claim
33 words
A method of measuring reduction of the surface layer material according to claim 1, wherein use is made of a high energy resolution detector to find spatial distribution ratios of said radioactive nuclides.
Claim 5
Dependent Claim
25 words
A method of measuring reduction of the surface layer material according to claim 1, wherein said high energy resolution detector is a high-purity germanium detector.
Claim 6
Independent Claim
130 words
An apparatus for measuring reduction of surface layer material wherein the reduction of the surface layer material is substituted for a change in the radioactivity in the surface layer of the material activated by neutrons or charged particles to measure the residual radioactivity in the surface layer of the material or to measure the radioactivity of the material that is removed from the surface layer and is trapped by a filter, characterized in that provision is made of a device that measures the energy spectra of the radioactivity, and a device that analyzes said energy spectra for every two or more kinds of radioactive nuclides to find a ratio of spatial distributions thereof, in order to find a calibration function and to measure the reduction of the surface layer material.
Claim 7
Independent Claim
130 words
An apparatus for measuring reduction of surface layer material wherein the reduction of the surface layer material is substituted for a change in the radioactivity in the surface layer of the material activated by neutrons or charged particles to measure the residual radioactivity in the surface layer of the material or to measure the radioactivity of the material that is removed from the surface layer and is trapped by a filter, characterized in that provision is made of a device that measures the energy spectra of the radioactivity, and a device that analyzes said energy spectra for every two or more kinds of radioactive nuclides to find a ratio of spatial distributions thereof, in order to find a calibration function and to measure the reduction of the surface layer material.
Claim 8
Dependent Claim
30 words
An apparatus for measuring reduction of the surface layer material according to claim 5, wherein said device for measuring the energy spectra of radioactivity is a high energy resolution detector.
Claim 9
Dependent Claim
25 words
An apparatus for measuring reduction of the surface layer material according to claim 6, wherein said high energy resolution detector is a high-purity germanium detector.
References Cited (Backward Citations)
No citation records indexed.
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