Question
In the decay sequence: U 92 238 → - x 1 T h 90 234 → - x 2 P a 91 234 → - x 3 Z   234 → - x 4 T h 90 234 x 1 ,   x 2 ,   x 3 and x 4 are the particles/ radiation emitted by the respective isotopes. The correct option(s) is/are: