Using a thermal ionization source combined with a sector magnetic analyzer and multi-collector simultaneous detection is the benchmark technique for high-precision isotope ratio measurements. Together with the isotope dilution method, it has long been considered the "gold standard" for U-Pb zircon dating and studies of timelines like Rb-Sr and Sm-Nd. Its extremely low ionization background and outstanding long-term stability make it the most solid data support platform for cutting-edge research in crust and mantle evolution, nuclear security and forensics, and marine and mantle geochemical tracing.