Radiometric Dating - A Brief Explanation Radiometric dating is the primary dating scheme employed by scientists to determine the age of the earth.Radiometric dating techniques take advantage of the natural decay of radioisotopes.

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However, noble gases such as helium have a complete set of electrons in their outer shell.

This means they normally have little interest in bonding with other atoms.

It features 24 hours of battery life and claims to be a 'mini-disco on the move'.

You may think of it as the gas in party balloons, but helium is one of the most valuable gases on Earth, with uses ranging from rocket fuel to MRI scanners.

The electrons are held around the nucleus in layers called shells.

Atoms bond by sharing the electrons on their outermost shells.

A large underground reserve of the precious gas was discovered in East Africa in 2016.

And now new estimates suggest that there is at least twice as much helium in the reserve than previously thought.

But that supply is dwindling after the US passed a law in 1996 obliging it to sell off a certain volume of helium every year at a fixed price, in order to raise funds for the 2015, British Medical Association chair, Dr Mars Porter said it was 'a tragedy' to see the gas being sold off for party balloons.'I'm not a party pooper but this has gone too far, it is such a scant resource.' The reserve was discovered in the Great Rift Valley in Tanzania last year, and initial samples suggested that deposits contained around 2.6 per cent helium, mixed with nitrogen.

Based on that estimate, experts from the US Geological Survey predicted that the reserve contained around 54 billion cubic feet (1.5 billion cubic meters) of helium - an amount described as 'life-saving.'But new measurements by experts from Helium One, suggest that the deposits contain up to four times the concentrations of helium than previously predicted.

Speaking to Live Science, Thomas Abraham-James, CEO of Helium One, explained that the firm now believes that the Tanzanian reserve contains about 98.6 billion cubic feet (2.8 billion cubic meters) of helium.