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Quantum Beam Materials Analysis and Harsh-Environment Semiconductor Device Engineering Lab
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The lab examines materials with neutrons and X-rays and develops radiation-resistant diamond semiconductors.
AboutAbout the lab
Quantum beams and diamond semiconductors
The Quantum Beam Materials Analysis and Harsh-Environment Semiconductor Device Engineering Lab conducts materials research using neutrons and X-rays, and develops radiation-resistant semiconductor devices and radiation measurement instruments.
The lab consists of two groups: the Ohnuma Lab (Quantum Beam Materials Engineering Lab A) and the Kaneko Lab (Harsh-Environment Semiconductor Device Engineering Lab).
The Ohnuma Lab studies the structure of matter using neutron and X-ray beams, and also researches a cancer treatment that uses a compact accelerator (boron neutron capture therapy).
The Kaneko Lab handles semiconductors from purification of raw materials through crystal growth to device fabrication, and currently focuses on developing diamond semiconductor devices for nuclear reactor accident response and decommissioning.
Key terms
- Neutron
- One of the particles that make up atomic nuclei. Because it carries no electric charge, it penetrates deep into matter and is used to examine interiors
- Diamond semiconductor
- A semiconductor made of diamond. It is resistant to radiation and high temperatures
- Boron neutron capture therapy
- A treatment in which neutrons are directed at boron accumulated in cancer, and the resulting particles destroy only the cancer cells. Also called BNCT
NewsLab news
A doctoral student received the Fellow Award from the Atomic Energy Society of Japan
A doctoral student received the Poster Award at the Autumn Meeting of the Japan Society of Applied Physics
A doctoral student received the EMS Student Encouragement Award at the Electronic Materials Symposium
A doctoral student received the Excellent Presentation Award at the Autumn Symposium of the Ceramic Society of Japan
A doctoral student received the EMS Student Encouragement Award at the Electronic Materials Symposium
ResearchResearch themes
The lab studies the structure of matter using quantum beams such as neutrons and X-rays, and develops diamond semiconductor devices that withstand radiation and high temperatures, as well as radiation measurement instruments. It also works on equipment needed in the field, such as for responding to severe accidents at nuclear reactors and for decommissioning the Fukushima Daiichi Nuclear Power Station.
*Illustrative imageInvestigating Materials with Small-Angle Scattering of Neutrons and X-rays
Using neutron and X-ray beams, the lab examines the structure, motion, and magnetic properties of matter at the level of atomic nuclei. From X-ray measurement results, it quantitatively evaluates structures such as nanoscale particles, and by using X-rays together with neutrons it obtains a variety of information.
*Illustrative imageBNCT with a Compact Accelerator
This research concerns a treatment (BNCT) in which neutrons are directed at boron accumulated in a tumor to selectively destroy tumor tissue. Using Monte Carlo calculations, the lab is working on methods to efficiently produce neutrons with a compact accelerator and on designing equipment that shapes the neutron beam to suit treatment.
*Illustrative imageDiamond Semiconductor Devices
For electronics used in responding to severe nuclear reactor accidents and in decommissioning, the lab is developing diamond transistors that are radiation-resistant and operate even at high temperatures. Students build the devices themselves in a cleanroom through many process steps.
*Illustrative imageDiamond Crystals and Radiation Measurement
The lab synthesizes single-crystal diamond for radiation measurement and makes detectors that can measure radiation energy even at 500°C. Using this detection element, it is developing, jointly with other institutions, a criticality approach monitor for use in retrieving debris at the Fukushima Daiichi Nuclear Power Station.
MembersFaculty
The members of the Quantum Beam Materials Analysis and Harsh-Environment Semiconductor Device Engineering Lab consist of faculty, postdoctoral researchers, academic researchers, technical and administrative staff, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorMasato Ohnuma
- Associate ProfessorJunichi Kaneko
- Assistant ProfessorFujio Hiraga
- Assistant ProfessorMichinori Ishida
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Syn diamonds” 2x910 / CC BY-SA 4.0 (cropped)
- Investigating Materials with Small-Angle Scattering of Neutrons and X-rays: “Neutron Research facility ( )” National Institute of Standards and Technology / Public domain (cropped)
- BNCT with a Compact Accelerator: “Boron neutron capture therapy (bnct) illustration” Pat Kenny (Illustrator) / Public domain (cropped)
- Diamond Semiconductor Devices: “DiaTr1” Materialscientist / CC BY-SA 3.0 (cropped)
- Diamond Crystals and Radiation Measurement: “CVD diamond” Kugel / CC BY-SA 3.0 (cropped)
- Related lab (Neutron Beam Applied Science and Engineering Lab): “Neutron Image of Asiatic Lilies Inside a Lead Cask ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Nuclear Reactor Engineering Lab): “Cerenkov Effect” United States Nuclear Regulatory Commission / Public domain (cropped)
- Related lab (Quantum Beam Applied Medical Engineering Lab): “Cyclotron - University of Washington” Ikiwaner / CC BY-SA 3.0 (cropped)
- Related lab (Plasma Materials Engineering Lab): “Plasma generation in air” Rcaravit / CC BY 4.0 (cropped)
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