In the last 20 years geologists have begun measuring accumulation of Helium (He)in some minerals because these minerals can retain He at temperatures up 100-200°C.The "date" gives a time when the material cooled below the temperature where the helium began to be retained,which is related to the depth of the material.Where do you think the He comes from that allows this technique to work?
A)the atmosphere,like carbon-14
B)the sun
C)beta decay of some radioactive element
D)alpha decay of some radioactive element

Question

Quizplus · Accepted Answer

Helium is produced through alpha decay of radioactive elements such as uranium and thorium, which are commonly found in minerals. Therefore, measuring accumulation of helium in minerals allows for dating based on the decay of these elements.

In the Last 20 Years Geologists Have Begun Measuring Accumulation