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Positron Annihilation Lab
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A lab that uses positron annihilation to investigate defects and voids in materials.
AboutAbout the lab
Evaluating the inside of materials with positron annihilation
The Uedono Lab studies materials evaluation using a phenomenon called positron annihilation.
The lab investigates the physical properties of materials by measuring the energy distribution of the gamma rays emitted when a positron collides with an electron and the two annihilate, as well as the lifetime of the positron.
The materials it evaluates range widely, including metals, semiconductors, and polymers. Through joint research with companies and research institutions in Japan and abroad, the lab evaluates and analyzes samples provided to it, supporting materials development.
Alongside materials evaluation, the lab also develops and improves slow positron beamlines and positron lifetime measurement systems.
Key terms
- Positron annihilation
- A phenomenon in which a positron collides with an electron and the two annihilate, emitting gamma rays. Materials are evaluated from the gamma rays and the positron lifetime.
- Vacancy-type defects
- Defects formed in a crystal when atoms are missing. Positron annihilation spectroscopy is a technique highly sensitive to detecting them.
- Free volume
- The volume of the gaps between molecules inside a polymer. It is closely related to gas permeability and can be measured directly by positron lifetime measurements.
ResearchResearch themes
The lab conducts materials evaluation using positron annihilation, and the materials it evaluates range widely, including metals, semiconductors, and polymers. Alongside materials evaluation, the lab also develops and improves slow positron beamlines and positron lifetime measurement systems.
*Illustrative imageDefect Evaluation in Nitride Semiconductors
Point defects in nitride semiconductors affect their electrical properties and may also suppress light emission and light absorption. Using positron annihilation spectroscopy, the lab evaluates vacancy-type defects and investigates the behavior of the introduced defects.
*Illustrative imageFree Volume Evaluation in Polymer Materials
For polymers used in food packaging, how easily gas passes through them affects how well the food's quality is preserved. Using positron lifetime measurements to evaluate free volume, the lab clarified the relationship between free volume and gas barrier properties.
MembersFaculty
The Uedono Lab consists of faculty members, master's students, and undergraduate students.
- ProfessorAkira Uedono
- Assistant ProfessorSelvakumar Sellaiyan
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: “Testing AstroPix, A New Gamma-Ray Detector (SVS14809 - ASTEP Chips3)” NASA's Scientific Visualization Studio - University of Maryland College Park/Jeanette Kazmierczak, eMITS/Sophia Roberts, eMITS/Scott Wiessinger, Dan Violette, NASA/GSFC/Regina Caputo / Public domain (cropped)
- Defect Evaluation in Nitride Semiconductors: “Blue light emitting diodes over a proto-board” Gussisaurio / CC BY-SA 3.0 (cropped)
- Free Volume Evaluation in Polymer Materials: “Polymer chain SPT” SPT Paul Topham / CC BY-SA 4.0 (cropped)
- Related lab (蛋白質学): “CSIRO ScienceImage 1196 Protein crystals” Health Sciences and Nutrition, CSIRO / CC BY 3.0 (cropped)
- Related lab (有機半導体物性工学研究室): “Detail of polycrystalline silicon solar cell” Elvis untot. / CC BY-SA 3.0 (cropped)
- Related lab (超伝導物性工学研究室): “Magnet levitating on top of superconductor cooled by liquid nitrogen” Ainur physicist / CC BY 4.0 (cropped)
- Related lab (半導体材料): “4 inch float zone n-type silicon wafer with amorphous silicon thin film heterojunction structure” Radiotrefoil / CC BY-SA 4.0 (cropped)
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