Thoron Progeny
Thoron Progeny : The (short lived) radioactive decay products of thoron. Namely, polonium-216 (sometimes called thorium A), lead-212 (thorium B), bismuth-212 (thorium C), polonium-212 (thorium C', 64%) and thallium-208 (thorium C., 36%). The stable decay product lead-208 is sometimes known as thorium D