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Radiochemistry Lab
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The lab uses radioisotopes to explore everything from superheavy elements to the global environment.
AboutAbout the lab
Radioisotopes, from superheavy elements to the global environment
The Radiochemistry Lab uses radioisotopes to carry out a wide range of research, from superheavy element science to earth and environmental science.
Using radionuclides in the environment as clues, the lab studies seawater circulation, dating, and paleoclimate reconstruction.
The lab also conducts surveys of nuclear-contaminated areas around the world, including Kazakhstan, Chernobyl, Fukushima, and Hiroshima.
Students in the College of Chemistry, School of Science and Engineering at the University of Tsukuba can choose this lab when they advance to their fourth year.
Key terms
- Radioisotope
- An isotope of an element whose nucleus is unstable and changes into another nucleus while emitting radiation
- Lanthanides
- A group of elements that includes europium. Demand is high, but supply is limited
- Accelerator mass spectrometer
- An instrument that accelerates the atoms of a sample and separates them by mass to measure extremely small amounts of isotopes. Abbreviated as AMS
- Seawater circulation tracer
- A substance in seawater that serves as a marker for tracking how seawater flows and mixes
ResearchResearch themes
The lab uses radioisotopes to carry out a wide range of research, from superheavy elements to earth and environmental science. Its work includes analyzing the behavior of radionuclides in the environment and developing methods to measure ultra-trace amounts of radionuclides.
*Illustrative imageRecovering lanthanides from liquid waste
The lab is focusing on liposomes loaded with ligands as a way to recover lanthanides from high-level radioactive liquid waste, separate them from one another, and reuse them. It is trying to clarify the adsorption behavior of europium and the stoichiometry of the adsorption reaction.
*Illustrative imageMeasuring ²¹⁰Pb by accelerator mass spectrometry
²¹⁰Pb is used to date environmental samples from recent years, but there is no method to measure many low-concentration natural samples in a short time. The lab aims to establish a measurement method using an accelerator mass spectrometer (AMS) and apply it to environmental samples.
*Illustrative image²³⁷Np analysis for tracing seawater circulation
²³⁷Np is expected to be useful as a tracer of seawater circulation, but its concentration in seawater is so extremely low that even quantifying it is difficult. The lab is working on producing a spike and developing a simple preconcentration method, aiming to propose a mass spectrometry method for seawater.
*Illustrative imageAnalysis of ultra-trace ⁹⁹Tc in seawater
Monitoring ⁹⁹Tc in the ocean is essential, but its concentration in seawater is extremely low, and concentrating and purifying it requires complicated chemical separation. The lab is working on improving the sensitivity of ICP-MS and developing a simple separation method, aiming for rapid and simple quantification.
MembersFaculty
The Radiochemistry Lab's members are faculty, specially appointed professors, researchers, and master's and undergraduate students.As of 2026
- ProfessorAya Sakaguchi
- Associate ProfessorShinya Yamasaki
- Assistant ProfessorYudai Shigekawa
- Specially Appointed ProfessorKeisuke Sueki
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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: “Radiochemistry Laboratory ( )” IAEA Imagebank / CC BY 2.0 (cropped)
- Recovering lanthanides from liquid waste: “Rareearthoxides” Peggy Greb, US department of agriculture / Public domain (cropped)
- Measuring ²¹⁰Pb by accelerator mass spectrometry: “Chronosphere Laboratory of Radiocarbon Dating P3097636” Kestrel / CC BY-SA 4.0 (cropped)
- ²³⁷Np analysis for tracing seawater circulation: “Deployment of oceanographic research vessels” NASA / Public domain (cropped)
- Analysis of ultra-trace ⁹⁹Tc in seawater: “Seawater sampling (dgjpn2502b0397)” IAEA Imagebank / CC BY 2.0 (cropped)
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