But this isotope is radioactive and decays about six times faster than does uranium 238, which indicates that the fissile fraction was much higher in the distant past.
But this isotope is radioactive and decays about six times faster than does uranium 238, which indicates that the fissile fraction was much higher in the distant past.
但是，铀235是具放射性的，而且衰变的速度比铀238快六倍，表示在古代，这个易分裂同位素的比率，比现在高得多。