High-precision timing of the Quaternary standard samples with thermal ionization mass spectrometry (TIMS) U-series method

Two national stalagnlite standards (GBW04412, GBW04413) and one international coral standard (RKM-4) have been determined by using thcrmal ionization mass spcctrometry (TIMS) method. The values of (234U/238U)act, (230Th/234U)act and age are all consistent in error range with thc stantlard values obtained by using α spectrometry.