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But for the average layperson trying to understand Egyptian history, it is often a case of ‘Where do I start? ’ There are so many names, dynasties and dates bandied around with seeming authority that it is a confusing topic to investigate.

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Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.

Based on pottery and architectural signifiers, the heavily fortified structure — and the rest of the Spring Citadel protecting Jerusalem’s precious water source — were dated to Canaanite construction (Middle Bronze II period).

In addition to protecting the Gihon Spring, the massive fortification served as a sort of security barrier and permitted one entrance to the spring — “from the west only, from within the city,” according to the City of David website.

Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).

The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.