Also an interesting Wikipedia entry here, https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thorium-229m https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thor

Also an interesting Wikipedia entry here, https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thorium-229m https://en.wikipedia.org/wiki/Isotopes_of_thorium#Thorium-22... Fascinatingly weird physics!