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：US20230393082A1

公开(公告)日：2023-12-07

申请号：US18031745

申请日：2021-10-15

Applicant: RIKEN

Inventor： Kunihiro FUJITA ,  Chihiro IWAMOTO ,  Takaoki TAKANASHI ,  Yoshie OTAKE

IPC: G01N23/20008

CPC classification number: G01N23/20008 ,  G01N2223/316

Abstract: A nondestructive inspecting device (10) includes a neutron emission device (2) that emits a neutron beam to a local irradiation location on a surface (la) of an inspection target (1), a detection device (3) that detects, at each of inspection positions facing the surface (la), scattered neutrons returned from the inspection target (1) as a result of emission of the neutron beam to the irradiation location, and measures the detected number of the scattered neutrons at each of the detection positions, and a ratio calculation unit (5) that calculates, for each of the detection positions, a ratio of the detected number at the detection position to a reference value for the detection position, and outputs the ratios. The reference value is set as the detected number at each of the detection positions in an assumed case of no defects existing in the inspection target (1).

公开(公告)号：US20230213462A1

公开(公告)日：2023-07-06

申请号：US18008747

申请日：2021-06-18

Applicant: RIKEN

Inventor： Yoshie OTAKE ,  Yoshimasa IKEDA ,  Yuichi YOSHIMURA ,  Takao HASHIGUCHI ,  Maki MIZUTA ,  Hirokazu KITAGAWA ,  Kenta KATO

IPC: G01N23/20008 ,  G01N33/2045

CPC classification number: G01N23/20008 ,  G01N33/2045

Abstract: A cable inspection device non-destructively inspects a cable used for supporting a bridge. The cable inspection device includes a neutron source and a neutron detection device. The neutron source emits neutrons to the cable. The neutron detection device includes a detection surface arranged outside the cable, and detects target neutrons and measures the number of the detected target neutrons when neutrons are emitted to the cable. The target neutrons are among the neutrons released from the cable and incident on the detection surface, and each have an energy equal to or lower than a predetermined value that is lower than an energy of a fast neutron.

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.

公开(公告)号：US20220128489A1

公开(公告)日：2022-04-28

申请号：US17310845

申请日：2020-02-27

Applicant: Topcon Corporation ,  RIKEN

Inventor： Hisashi TSUKADA ,  Shigenori NAGANO ,  Yoshie OTAKE ,  Hideyuki SUNAGA ,  Yuichi YOSHIMURA ,  Koji IKADO

IPC: G01N23/20

Abstract: The neutron emission unit is configured to emit neutrons such that a center axis (Nh) of neutron emission intersects a center axis direction of collimators (23a to 23e). A calculation unit is capable of generating information about an inspection object in the center axis direction of the collimators, based on position information of the neutron detector and/or position information of the neutron emission unit, information about an angle (θ1) at which the center axis of the neutron emission intersects the center axis direction of the collimators, and a neutron amount detected by the neutron detector.

公开(公告)号：US20210262947A1

公开(公告)日：2021-08-26

申请号：US17059002

申请日：2019-05-28

Applicant: RIKEN ,  Nissan Chemical Corporation

Inventor： Takaoki TAKANASHI ,  Shigeho NODA ,  Masaru TAMURA ,  Yoshie OTAKE

IPC: G01N23/046 ,  G06T11/00

Abstract: In order to increase reproducibility of a reconstructed tomographic image without increasing the computational load, detection is performed by oversampling in (N+n) directions during imaging for detection by N detection elements. A vector having N×(N+n) elements is obtained, and vector decimation step is performed in which a total of n×N elements corresponding to a sequence {k} 30 denoting a decimation order are removed. In a discrete Radon transform step, a corresponding discrete Radon inverse matrix WSQ−140 is operated, and in an image data generation step, de-vectoring is performed, thereby tomographic image data are acquired. When oversampling is used, a discrete Radon inverse matrix WSQ−1 is obtained. Therefore, a tomographic image is obtained by matrix computation without resorting to iterative approximation.

公开(公告)号：US20180259462A1

公开(公告)日：2018-09-13

申请号：US15910706

申请日：2018-03-02

Applicant: RIKEN

Inventor： Yoshie OTAKE ,  Yoshimasa IKEDA

IPC: G01N23/204 ,  G01T3/06

CPC classification number: G01N23/204 ,  G01T3/06 ,  G01V5/0025

Abstract: A non-destructive inspection device 10 using backscattering of neutrons includes a neutron source 3 that radiates a pulse neutron beam to a surface 1a of an inspection target 1, a neutron detection device 5 that detects scattered neutrons scattered in the inspection target 1 and returned, and a measurement device 7 that measures the detection number of scattered and returned neutrons detected by the neutron detection device 5 and generates detection number data expressing the detection number with respect to time.