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Old 2021-09-15, 15:44   #502
chris2be8's Avatar
Sep 2009

42608 Posts

Originally Posted by Dr Sardonicus View Post
Helium-3? Why Helium-3 specifically? I could understand Helium-4 being present. Uranium (over 99% being U-238) is a common constituent of rocks. U-238 undergoes radioactive decay by emitting an alpha particle, and alpha particlesa are Helium-4 nuclei.
I *think* it's because helium-3 will be primeval gas incorporated into the earth when it formed. Most of the helium-3 in the crust will have escaped by now. So significant emissions show that magma from deep inside the earth is approaching the surface.

Since helium-4 is produced in the crust now increased emissions don't tell you much about where it's coming from.
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