Riken Corporation

Nissan Chemical Corporation

The Kitasato Institute

Takaoki Takanashi

Yoshie Otake

Daniel Antonio Sahade

Toshimasa Hamada

Takuya Maeyama

Shigeho Noda

Naohiro Kanda

Masaru Tamura

Kunihiro Fujita

Chihiro Iwamoto

A nondestructive inspecting device () includes a neutron emission device () that emits a neutron beam to a local irradiation location on a surface (la) of an inspection target (), a detection device () that detects, at each of inspection positions facing the surface (la), scattered neutrons returned from the inspection target () 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 () 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 ().

Nondestructive inspecting device, and nondestructive inspecting method

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

Radiation dosimetry gel and radiation dosimeter comprising same as material for measuring radiation dose

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&#xd7;N pixels, and the angle of the offset is made to be above 0 degrees and under 90 degrees or above &#x2212;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&#xd7;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&#xd7;N elements. The second vector is de-vectorized to obtain image data for a two-dimensional tomographic image of N pixels&#xd7;N pixels. An inverse matrix of a system matrix for an offset is obtained and used as the discrete Inverse Radon transform matrix.

Acquisition method, acquisition device, and control program for tomographic image data by means of angular offset

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&#xd7;(N+n) elements is obtained, and vector decimation step is performed in which a total of n&#xd7;N elements corresponding to a sequence {k}denoting a decimation order are removed. In a discrete Radon transform step, a corresponding discrete Radon inverse matrix Wis 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 Wis obtained. Therefore, a tomographic image is obtained by matrix computation without resorting to iterative approximation.

Method and device for acquiring tomographic image data by oversampling, and control program

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.

Growing community of inventors

Wako, Japan

Takaoki Takanashi