Here are some facts on Thorium.
The half-life of thorium-232 is about 14.05 billion years.
Can someone please explain to me how thorium can be a safe alternative to Uranium in the production of nuclear energy?
Twenty-seven radioisotopes have been characterized, with a range in atomic weight from 210 u (210Th) to 236 u (236Th).[8] The most stableisotopes are:
- 232Th with a half-life of 14.05 billion years, it represents all but a trace of naturally occurring thorium.
- 230Th with a half-life of 75,380 years. Occurs as the daughter product of 238U decay.
- 229Th with a half-life of 7340 years. It has a nuclear isomer (or metastable state) with a remarkably low excitation energy of 7.6 eV.[9]
- 228Th with a half-life of 1.92 years.
All of the remaining radioactive isotopes have half-lives that are less than thirty days and the majority of these have half-lives that are less than ten minutes.
Above facts taken from Wikipedia.