公开(公告)号：US20200333474A1

公开(公告)日：2020-10-22

申请号：US16753244

申请日：2018-10-01

Applicant: RIKEN ,  THE KITASATO INSTITUTE ,  NISSAN CHEMICAL CORPORATION

Inventor： Takuya MAEYAMA ,  Daniel Antonio SAHADE ,  Takaoki TAKANASHI

IPC: G01T1/105 ,  G01T1/04 ,  G01N21/64 ,  C09K11/06

Abstract: A radiation dosimetry sol or gel, and a radiation dosimeter containing the sol or the gel as a material for radiation dosimetry. A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; and a silicate salt (B). A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; a silicate salt (B); a water-soluble organic polymer (C) having an organic acid salt structure or an organic acid anion structure; and a dispersant (D) for the silicate salt (B). A radiation dosimeter including, as a material for radiation dosimetry, the above-mentioned radiation dosimetry sol or gel.

公开(公告)号：US20220221594A1

公开(公告)日：2022-07-14

申请号：US17614254

申请日：2020-05-18

Applicant: RIKEN ,  NISSAN CHEMICAL CORPORATION

Inventor： Takaoki TAKANASHI ,  Daniel Antonio SAHADE ,  Toshimasa HAMADA

IPC: G01T1/04 ,  C08F20/06 ,  C08F2/54 ,  C08K3/34 ,  C08J3/075

Abstract: There is provided a radiation dosimetry gel that is usable in a polymer gel dosimeter having an improved sensitivity and high safety.
A radiation dosimetry gel comprising a gelator, and a compound of the following Formula (1): (wherein R1 is a hydrogen atom or a methyl group;
m and n are each an integer of 2 to 4;
k is 0 or 1; and
plurality of R1s and ms are each the same as or different from one another) and a radiation dosimeter comprising the radiation dosimetry gel as a material for radiation dosimetry.

公开(公告)号：US20250027890A1

公开(公告)日：2025-01-23

申请号：US18712873

申请日：2022-10-25

Applicant: RIKEN

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

IPC: G01N23/05

Abstract: An observation device includes a neutron emission device, a detection device, and a data processing device. The neutron emission device emits neutrons to an inspection object. The detection device detects exit neutrons from the inspection object at one set of detection positions in a peripheral direction around the inspection object, outside the inspection object, and measures the number of the detected exit neutrons for each of the detection positions. The data processing device generates reconstructed cross-sectional data by performing reconstruction processing based on the number of the detected exit neutrons at each of the one set of detection positions. The reconstructed cross-sectional data represent a two-dimensional distribution of a neutron reaction rate in an imaginary cross-section of the inspection object.

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：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：US20210228167A1

公开(公告)日：2021-07-29

申请号：US17059007

申请日：2019-05-28

Applicant: RIKEN ,  Nissan Chemical Corporation

Inventor： Naohiro KANDA ,  Takaoki TAKANASHI

IPC: A61B6/00 ,  G06T11/00 ,  A61B6/03

Abstract: In an embodiment of the present disclosure, in order to raise the reproducibility of a reconstructed tomographic image without increasing a calculation load, any one among two directions adjacent to two boundaries that demarcate an angular scan range is offset from any one among coordinate axes of a two-dimensional tomographic image of N pixels×N pixels, and the angle of the offset is made to be above 0 degrees and under 90 degrees or above −90 degrees and under 0 degrees. A detection device, which includes N detection elements, performs detection in each detection direction, and a first vector having N×N elements is obtained from a detection signal obtained by the detection device in a detection operation. A discrete Inverse Radon transform matrix is applied to the first vector to obtain a second vector having N×N elements. The second vector is de-vectorized to obtain image data for a two-dimensional tomographic image of N pixels×N pixels. An inverse matrix of a system matrix for an offset is obtained and used as the discrete Inverse Radon transform matrix.