a衰变 900 TU2-1G02y a(5.7%) 4.589MeV a(94.3%) 4.777MeV 0.188MeV sRn R衰变纲图(核子过多) 226Ra 88 222Rn 4He +Q 86 会X Y+2He+Q
T1/2=1602y
B袁变 4t4094049t T1/2=14.29d P 一S+e+8+Q 1.708MeV X → Y+ge+o0+Q s 好P衰变纲图(中子过多)
T1/2=14.29d
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