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：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：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.