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Asai Lab
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The lab uses light to measure radiation and develops the materials that make this possible.
AboutAbout the lab
Physical chemistry of excited states induced by quantum beams.
The Asai Lab controls electronic excited states generated by light and radiation, and develops optical materials that serve as radiation sensors.
The materials it develops are intended for use in medical settings, such as nuclear medicine diagnostics and quantum beam therapy for cancer.
They are also intended for use in security, nondestructive testing, environmental monitoring, and as detectors for synchrotron radiation science and particle physics experiments.
The lab works with a wide range of material systems, including inorganic single crystals, ceramics, glasses, organic materials, and organic-inorganic hybrid materials.
Key terms
- Excited state
- A state in which light or radiation has raised an electron to a higher energy than usual.
- Scintillator
- A material that emits light the instant radiation enters it. It is the core component of sensors that count radiation.
- Dosimeter
- A material that accumulates the amount of radiation it has received, which can be read out later to measure the dose.
NewsLab news
Open Campus 2026 held; lab tours for undergraduates also accepted
A master's student received a Presentation Encouragement Award at the Workshop on Quantum Energy Conversion
Lab research published in Optical Materials
Lab research published in Journal of Materials Science: Materials in Electronics
Research by Assistant Professor Kawamoto published in Radiation Measurements
ResearchResearch themes
The lab controls electronic excited states generated by light and radiation, and develops optical materials that serve as radiation sensors. The materials fall broadly into two types: scintillators, which emit light the instant radiation strikes them, and dosimeters, which record the dose received.
*Illustrative imageScintillators
These are materials that emit fluorescence immediately after radiation enters them. Combined with a photodetector, they form a detector that operates in real time. The lab is developing materials with a high fluorescence yield, materials that emit light in a shorter time, and materials that interact readily with high-energy photons and neutrons.
*Illustrative imageDosimeters
These are materials that record the accumulated radiation dose received over a period of time so that it can be evaluated later. They store the energy produced by radiation, and the dose is read from the fluorescence emitted upon thermal or optical stimulation, or from the color change after irradiation. They can also produce images of dose distribution, like an X-ray photograph.
MembersFaculty
The members of the Asai Lab consist of faculty, master's and undergraduate students, and administrative assistants.As of 2026
- ProfessorKeisuke Asai
- Associate ProfessorYutaka Fujimoto
- Assistant ProfessorHiroki Kawamoto
VoicesStudent voices
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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: “FZU scintillators 1” René Volfík / CC BY-SA 4.0 (cropped)
- Scintillators: “Cylindrical BGO Crystal” Thunderblood101 / CC BY-SA 4.0 (cropped)
- Dosimeters: “Thermolumine” Mauswiesel / CC BY-SA 3.0 (cropped)
- Related lab (Kubo Lab): “Ferrofluid in magnetic field” Steve Jurvetson / CC BY 2.0 (cropped)
- Related lab (Takizawa Lab): “Radiance” PhVKK Кирюханцев-Корнеев Филипп Владимирович / Научно-учебный центр СВС / ДНК Наука НИТУ «МИСиС» http://science.misis.ru/ / CC BY-SA 4.0 (cropped)
- Related lab (Jinnai Lab): “Block Copolymer ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Tomishige Lab): “Dry Raney nickel” en:User:Rune.welsh / CC BY-SA 3.0 (cropped)
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