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The film Underbelly Files: Tell Them Lucifer Was Here concerns the murder of two Victorian police officers and the subsequent hunt for their killers.

Radiodating isotopes

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Deep below the rim, the crystalline basement rocks tower above the turbulent Colorado River.Official publications say these rocks are more than a billion years old, but when the methods used to date them are carefully examined, a totally different story is discovered.To date a radioactive rock, geologists first measure the “sand grains” in the top glass bowl (the parent radioisotope, such as uranium-238 or potassium-40).

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These were once flows of basalt lava, up to tens of metres thick (figure 4).

Yet this view is based on a misunderstanding of how radiometric dating works.

Part 1 (in the previous issue) explained how scientists observe unstable atoms changing into stable atoms in the present.

The amount of the isotope in the object is compared to the amount of the isotope's decay products.

The object's approximate age can then be figured out using the known rate of decay of the isotope.