Debris from China's eighth nuclear explosion test was examined with gamma-spectrographic and autoradiographic methods. Nearly all of the debris was borne by submicroscopic particles, and “hot” particles, visible under the microscope (>= 0.2 μm) were very rare. The few found were all nearly colourless spheres. Their specific beta-activity was the highest found so far. The largest particles are highly fractionated (especially mass-chain 141) but debris “in bulk” is not, as the gravitational separation between differently sized particles during the transport process is negligible. The difficulties in interpreting the fractionation factors of the hot particles as a reflection of the time between explosion and particle formation is discussed. If the particles are assumed to consist of Al2O3 and no mutual fractionation between Al and mass-chain 95 has occurred, the content of inactive construction material incorporated in the fire ball is estimated to be about 300 kg Al.