公开(公告)号：US20210033542A1

公开(公告)日：2021-02-04

申请号：US17066593

申请日：2020-10-09

Applicant: RIKEN

Inventor： Yasuo WAKABAYASHI ,  Yoshie OTAKE ,  Yujiro IKEDA

IPC: G01N23/02 ,  G01T1/16

Abstract: A nondestructive inspection apparatus makes a neutron beam incident on an inspection target, detects a specific gamma ray deriving from a target component in the inspection target, among gamma rays generated by the neutron beam, and determines a depth at which the target component exists, based on a result of the detecting. The nondestructive inspection apparatus includes a neutron source that emits a neutron beam to a surface of the inspection target, a gamma ray detection device that detects, as detection intensities, intensities of a plurality of types of specific gamma rays whose energy differs from each other, and a ratio calculation unit that determines a ratio between the detection intensities of a plurality of types of the specific gamma rays.

公开(公告)号：US20240295511A1

公开(公告)日：2024-09-05

申请号：US18648861

申请日：2024-04-29

Applicant: RIKEN

Inventor： Yasuo WAKABAYASHI ,  Yoshie OTAKE ,  Massato TAKAMURA ,  Yujiro IKEDA

IPC: G01N23/222 ,  G01N33/38

CPC classification number: G01N23/222 ,  G01N33/383 ,  G01N2223/0745 ,  G01N2223/1013 ,  G01N2223/106

Abstract: A non-destructive inspection device includes a neutron generation portion, a neutron shield portion, a gamma ray detector, and a gamma ray shield portion. The neutron generation portion emits neutrons spontaneously, or emits neutrons by DD nuclear fusion reaction or DT nuclear fusion reaction. The neutron shield portion is covers the neutron generation portion from at least an area around the neutron generation portion and thereby shields the neutrons at the area, and allows the neutrons to be emitted to a front side of the neutron generation portion. The gamma ray detector detects gamma rays generated in an inspection object on a front side of the neutron generation portion. The gamma rays are generated by the neutrons incident on the inspection object. The neutron shield portion, the gamma ray shield portion, and the gamma ray detector are arranged in this order in alignment with each other in a lateral direction.

公开(公告)号：US20240272102A1

公开(公告)日：2024-08-15

申请号：US18563557

申请日：2022-05-24

Applicant: TOPCON CORPORATION ,  RIKEN

Inventor： Shigenori NAGANO ,  Satoshi YANOBE ,  Akira YAJIMA ,  Hanako AIKOH ,  Satoru ISHIGURO ,  Yoshie OTAKE ,  Yasuo WAKABAYASHI ,  Masato TAKAMURA

IPC: G01N23/222 ,  G01T1/02 ,  G01T7/12

CPC classification number: G01N23/222 ,  G01T1/02 ,  G01T7/12 ,  G01N2223/0745 ,  G01N2223/631

Abstract: This non-destructive inspection system 1 has a non-destructive inspection device 2 and a management device 3. The non-destructive inspection device 2 is provided with: a neutron emission unit 10 capable of emitting a neutron beam; a gamma ray detection unit 20 capable of detecting gamma rays; a device casing 30 covering the neutron emission unit 10 and the gamma ray detection unit 20, an opening 30a being formed in the device casing 30; an outer shutter 31 that opens/closes the opening 30a; dose monitors 51, 52, 53 provided to the device casing 30, the dose monitors 51, 52, 53 detecting the radiation dose; a device communication unit 56 capable of transmitting device information including the detected radiation dose to the management device 3, and capable of receiving inspection permission information from the management device 3; and a device control unit 40 that, when the inspection permission information is acquired, opens the outer shutter 31 and enables emission of a neutron beam from the neutron emission unit 10.

公开(公告)号：US20240192153A1

公开(公告)日：2024-06-13

申请号：US18553264

申请日：2022-03-31

Applicant: TOPCON CORPORATION ,  RIKEN

Inventor： Shigenori NAGANO ,  Satoshi YANOBE ,  Akira YAJIMA ,  Hanako AIKOH ,  Satoru ISHIGURO ,  Yoshie OTAKE ,  Yasuo WAKABAYASHI ,  Masato TAKAMURA

IPC: G01N23/222 ,  G01N23/204 ,  G01N23/2206

CPC classification number: G01N23/222 ,  G01N23/204 ,  G01N23/2206 ,  G01N2223/0745

Abstract: A nondestructive inspection system 1 is provided with: a neutron radiation unit 10 capable of radiating a first neutron dose of neutrons; a neutron detection unit 20 capable of detecting a second neutron dose of neutrons scattered inside an inspection object A upon radiation of neutrons from the neutron radiation unit 10; a gamma ray detection unit 30 capable of detecting a gamma ray dose released from the inspection object A upon radiation of neutrons from the neutron radiation unit 10; and an analysis unit 50 that calculates the contained amount of a predetermined substance on the basis of the gamma ray dose and corrects the contained amount of the predetermined substance on the basis of the first neutron dose and the second neutron dose.

公开(公告)号：US20240183801A1

公开(公告)日：2024-06-06

申请号：US18553283

申请日：2022-03-31

Applicant: TOPCON CORPORATION ,  RIKEN

Inventor： Shigenori NAGANO ,  Satoshi YANOBE ,  Akira YAJIMA ,  Hanako AIKOH ,  Satoru ISHIGURO ,  Yoshie OTAKE ,  Yasuo WAKABAYASHI ,  Masato TAKAMURA

IPC: G01N23/00 ,  G01N23/22

CPC classification number: G01N23/005 ,  G01N23/22 ,  G01N2223/204

Abstract: A nondestructive inspecting device 1 is provided with: a neutron beam emitting unit 10 capable of emitting a neutron beam in a prescribed emission direction D1; a gamma ray detecting unit 20 capable of detecting a gamma ray incident from a prescribed detection direction D2 intersecting the emission direction D1; a device housing 30 which covers the neutron beam emitting unit 10 and the gamma ray detecting unit 20, and in which an opening portion 30a is formed in the emission direction D1 and the detection direction D2; an outer shutter 31 for opening and closing the opening portion 30a of the device housing 30; an external dose monitor 41 for detecting a radiation dose inside the device housing 30; an internal dose monitor 42 for detecting a radiation dose outside the device housing 30; and a control unit 40 for prohibiting opening of the outer shutter 31 if the radiation dose detected by at least either of the dose monitors 41, 42 exceeds a predetermined threshold.

公开(公告)号：US20230152250A1

公开(公告)日：2023-05-18

申请号：US17923057

申请日：2021-05-10

Applicant: RIKEN

Inventor： Yasuo WAKABAYASHI ,  Yoshie OTAKE ,  Yujiro IKEDA

IPC: G01N23/222

CPC classification number: G01N23/222 ,  G01N2223/0745 ,  G01N2223/106

Abstract: A concentration detector includes: a neutron source emitting neutrons to a target; a gamma ray detector detecting and determining an amount of specific gamma rays that are among gamma rays generated in the target by interactions with the neutrons; and a concentration calculator calculating a concentration of the target at selected depths in the inspection target, based on the detected amount. A relational expression expressing a relation between a plurality of concentrations of the target in a plurality of virtual layers and a detected amount of the specific gamma rays is predetermined for each type of the specific gamma rays or each detection condition. The concentration calculator applies the detected amount for each gamma ray type or each detection condition, to the relational expression for the type or the detection condition, and calculates a concentration of the target component in the layer at each depth or the specific depth.