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China Becomes First to Achieve Operation of a Thorium-229 Nuclear Optical Clock, Bringing Quantum Precision Measurement into the Atomic Nucleus Scale

Recently, the team of Ding Shiqian, associate professor in the Department of Physics at Tsinghua University, published important results online in the international academic journal Nature, announcing the successful development of a thorium-229 nuclear optical clock and the achievement of its stable operation. This work was completed independently in the same period as that of a European team, making China the first internationally to achieve operation of a thorium-229 nuclear optical clock, marking the successful extension of the time measurement standard from electronic transitions to nuclear transitions. It is understood that a nuclear optical clock uses the internal transition of the thorium-229 atomic nucleus as a time-frequency reference. Ding Shiqian, one of the corresponding authors of the paper, introduced that the pendulum of an old-fashioned wall clock swings about once per second, whereas a nuclear optical clock uses the beat of the atomic nucleus as its "pendulum," with a beat frequency of up to about 2 quadrillion times per second. Because the size of the atomic nucleus is only a few tens of thousandths of the electron cloud outside the nucleus...

2026-10-08

International Researchers Successfully Develop the First Autonomous Thorium-229 "Nuclear Clock": Featuring Ultra-Strong Interference Resistance and a Fully Autonomous Closed-Loop Stable Operation Mechanism

Recently, the press office of TU Wien (Vienna University of Technology) announced that a team of scientists from Austria, Germany, and the Czech Republic has successfully developed the world's first nuclear clock based on the thorium-229 (chemical symbol ²²⁹Th) atomic nucleus. This nuclear clock possesses extremely high interference resistance and is capable of operating in a fully autonomous mode without external stabilization. The research team stated that, compared with traditional atomic clocks that operate using entire atoms, timekeeping using atomic nuclei can theoretically achieve higher measurement precision. Two years ago, they successfully controlled the transition process of the thorium-229 atomic nucleus for the first time, but to achieve extremely high-precision timekeeping, it was still necessary to solve the nuclear clock...

2026-10-08

New Analytical Laboratory Completed at Oak Ridge to Support U-233 Cleanup and Medical Isotope Supply

The U.S. Department of Energy Oak Ridge Environmental Management Office (OREM) and its contractor Isotek Systems completed installation of a new analytical laboratory at Oak Ridge National Laboratory (ORNL) on August 25, 2026. The laboratory will support ORNL's highest-priority environmental cleanup project and accelerate delivery of critical medical isotope materials for cancer treatment research. Isotek Systems is responsible for removing the U.S. uranium-233 inventory stored at Oak Ridge National Laboratory. Uranium-233 was primarily developed in the 1950s and 1960s, initially intended for use as nuclear reactor fuel, but was later proven unsuitable as a commercial fuel source...

2026-08-26

U.S. Department of Energy Highlights Progress in Legacy Waste Cleanup and Medical Isotope R&D

Recently, senior officials from the U.S. Department of Energy attended an event hosted by the U.S. House Nuclear Cleanup Caucus, presenting the application progress of legacy nuclear waste cleanup efforts in medical isotope R&D and future energy technologies. The event, themed "DOE's Isotope Mission: Legacy Cleanup Saves Lives, Empowers America's Future," focused on how nuclear cleanup missions align with isotope production and medical research. DOE's Under Secretary for Science Dario Gil, along with Oak Ridge National Laboratory Environmental Management Office Manager Eric Olds and Savannah River Operations Office Manager Edwin DeShon, jointly attended the event. DeShon...

2026-08-03