Helium isotopes point to new sources of geothermal energy

[devance]

I always wanted a health spa, that had hot thermal springs.

'Earth's crust, on the other hand, is rich in radioactive elements like uranium and thorium that decay by emitting alpha particles, which are helium-four nuclei. Thus a high ratio of helium-three to helium-four in a fluid sample indicates that much of the fluid came from the mantle.

High helium ratios are common in active volcanic regions, where mantle fluids intrude through the ductile boundary of the lower crust. But when Kennedy and van Soest found high ratios in places far from volcanism, they knew that mantle fluids must be penetrating the ductile boundary by other means.'

But I have no Helium isotopes detector.

[devance]

http://www.physorg.com/news115580294.html

The link.