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The hominids used the tools to butcher the animals, although many of the animal bones from the site represent killings by other carnivores.One context, from Duinefontein 2, dated by optically stimulated luminescence dating to 270,000 BP contained ochre that must have been introduced to the site by people and which may have been used as body adornment.OSL works because all sediments have some natural radioactivity, caused by the presence of uranium, thorium and potassium isotopes in heavy minerals such as zircons. We analyse the quartz or feldspar minerals in sand deposits. Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.

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Once this sediment is deposited and subsequently buried, it is removed from light and is exposed to low levels of natural radiation in the surrounding sediment.Duinefontein 1 and 2 are early prehistoric archaeological sites near Cape Town in South Africa They have produced Acheulean stone tools and animal bones dating between 200,000 and 400,000 years ago.It was not a settlement site, but instead seems to have been a waterside location where animals could be hunted or scavenged when they died by hominids.All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.When these quartz or feldspar minerals are exposed to the ionising radiation emitted by the radioactive isotopes in zircons, electrons within the crystals migrate and become trapped in their crystal structure.

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