Thorium-234

Thorium-234 is an isotope of Thorium with 90 protons and electrons and 144 neutrons. It has a half life of 24.1 days. When it decays, it emits a beta particle and turns into Protactinium-234. It has a mass of 234.043601 grams/mole. It has a decay energy of 0.27 MeV. Uranium-238 decays into this element.