Isotope

Т1/2

Т1/2(SF)

SF (%)

nAbn

Decay mode

BF

Reference

235U

7.04(1) × 108 y

0.98(28) × 1019 y

7.0(2) × 10−9

1.86

α

100

[8] [11] [14]

231Th

25.52(1) h

-

β-

100

[15]