Osaka University

Mitsubishi Heavy Industries Mechatronics Systems, Ltd.

Hitachi, Ltd.

Isao Murata

Hiroshi Horiike

Eiji Hoashi

Itsuro Kato

Shuhei Kuri

Toshiharu Takahashi

Sachiko Doi

Syuhei Kuri

Izuru Matsushita

Sachiko Suzuki

Hiroyuki Takagi

Provided are a neutron monitor device and a neutron measurement method which make it easier to measure the intensity of the neutrons having the energy region of 10 KeV to several hundreds KeV. A neutron monitor device includes a first detector which includes a hemispherical first body formed of PE and having a radius of 31 mm, a first specimen containing GaN disposed at the center of the first body, a Cd layer provided on an outer surface of the first body, and a B layer provided inside the first body, and a second detector which includes a hemispherical second body formed of PE and having a radius of 27 mm, a second specimen containing GaN disposed at the center of the second body, a B layer provided on the outer surface of the second body, and a Cd layer provided inside the second body.

Neutron monitor device and neutron measurement method

There is provided a quench tank which is disposed in a circulation path of a liquid metal loop and separates and cools liquid metal steam or a mixed gas in liquid metal introduced into a tank body. The tank body includes a separating area which forms a substantially horizontal flow of the liquid metal, and a separating plate is disposed inside the tank body so as to be inclined with respect to the vertical direction.

Quench tank and liquid metal loop

The neutron irradiation apparatus includes an introduction tube for introducing a proton beam, a target structure provided in a lower end of the introduction tube, an aluminum fluoride layer disposed below the target structure in an irradiation path of neutrons generated in the target structure, and a heavy water layer placed under the aluminum fluoride layer in layers. The aluminum fluoride layer is set at a thickness that increases epithermal neutrons. Since use of only the aluminum fluoride layer increases its thickness too much, heavy water is placed. Heavy water moderates neutrons quickly, and allows increasing epithermal neutrons without increasing the thickness. The combination of the aluminum fluoride layer and the heavy water layer allows increasing epithermal neutrons by attenuating only fast neutrons without increasing thermal neutrons. Accordingly, neutron flux with many epithermal neutrons is obtained.

Neutron control device and neutron irradiation apparatus

There is provided a liquid metal target forming apparatus, including a nozzle that forms a liquid metal target in space, which is irradiated with a proton beam, by ejecting liquid metal thereto. A portion where a region that receives a proton beam of the liquid metal target is formed in a discharge port of the nozzle has a concavo-convex shape.

Liquid metal target forming apparatus

Provided is an X-ray energy spectrum estimation method capable of reproducing, with high precision, information on an attenuation path to which an X-ray is irradiated, and performing, with high precision, reconstruction of an X-ray CT image by enabling high-precision estimation of spectrum of energy released from an X-ray source device. An energy spectrum estimation device () normalizes a response function, and calculates a modified efficiency matrix from the normalized response function, a detection efficiency matrix, and a measurement-system correction coefficient. The energy spectrum estimation device then calculates a particular result in accordance with a Bayesian estimation equation, without divergence, with use of the calculated modified efficiency matrix, the normalized modified efficiency matrix, and an attenuation characteristic curve obtained by a measurement circuit (). The energy spectrum () calculates an X-ray energy spectrum by dividing, by the normalized modified efficiency matrix, the particular result obtained by the Bayesian estimation equation.

Growing community of inventors

Suita, Japan

Isao Murata