Age determination of the Peking Man at Zhoukoudian (Choukoutien) has been made by fission track dating based on fission track annealing properties in minerals. The age of the Peking Man was derived from the number o...Age determination of the Peking Man at Zhoukoudian (Choukoutien) has been made by fission track dating based on fission track annealing properties in minerals. The age of the Peking Man was derived from the number of tracks of 238U spontaneous fission in sphenes of grain size from 0.05 to 0.30 mm separated and selected from fire ashes left by the Peking Man.展开更多
Minute quantities of uranium is contained in all rocks and minerals as impurities and the 238U nuclei undergo spontaneous fissions at a constant rate. When fission fragments emitted from spontaneous fission pass throu...Minute quantities of uranium is contained in all rocks and minerals as impurities and the 238U nuclei undergo spontaneous fissions at a constant rate. When fission fragments emitted from spontaneous fission pass through a dielectric rock or mineral, continuous radiation damage tracks would be formed. Such tracks can be developed by chemical etching and observed under optical microscope, Radiation damage展开更多
文摘Age determination of the Peking Man at Zhoukoudian (Choukoutien) has been made by fission track dating based on fission track annealing properties in minerals. The age of the Peking Man was derived from the number of tracks of 238U spontaneous fission in sphenes of grain size from 0.05 to 0.30 mm separated and selected from fire ashes left by the Peking Man.
文摘Minute quantities of uranium is contained in all rocks and minerals as impurities and the 238U nuclei undergo spontaneous fissions at a constant rate. When fission fragments emitted from spontaneous fission pass through a dielectric rock or mineral, continuous radiation damage tracks would be formed. Such tracks can be developed by chemical etching and observed under optical microscope, Radiation damage