“Yb3+doped Lu2O3 crystal has become an ideal material for ultrafast scintillation detectors in extreme working environments due to its advantages of high temperature resistance, high density, and sub nanosecond decay characteristics. Experts have prepared ultrafast scintillation crystal Yb: Lu2O3 using temperature gradient method and studied its properties. Thermogravimetric differential scanning calorimetry, thermomechanical analysis, and compressive strength testing indicate that lutetium oxide has good thermal stability and compressive strength. Using the gamma ray source generated by 137Cs, an attenuation time of 1.5 ns and an absolute light yield of 56 photons/MeV were observed. The absolute light yield of Yb: Lu2O3 ultrafast scintillation crystal was tested for the first time. This marks the significant potential of Yb: Lu2O3 crystal as a candidate material in the field of high-energy physics experiments. Its efficient radiation response and excellent high-temperature and high-pressure service performance provide new ideas for optimizing the performance of next-generation scintillation devices.”