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About

Romancing the isotopes: radiometric dating

The key to using isotopes in this way is that some of them are radioactive, meaning that some isotopes decay into other elements. Without getting too much into the quantum physics of it, the reason decay happens is because this process causes an atom to lose energy, which tends to be a more stable state. There are a few different modes of radioactivity, but for our purposes we'll focus on two: In alpha decay, an atom loses two neutrons and two protons an alpha particle from the nucleus, reducing its atomic number by two and its weight by four. In beta decay, a neutron changes into a proton, releasing an electron a beta particle in the process, increasing its atomic by one but not changing its weight. Radiometric dating is the method of using this radioactive process to date things from the past. Carbon occurs in three different isotopes on the Earth. Most of it is carbon Carbon and carbon are stable, meaning they don't radioactively decay. Carbon is radioactive, and decays, via beta decay, into nitrogen

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Radiometric Dating Click image Introduction: An atom is usually comprised of a nucleus of protons having a mass and a positive charge and neutrons having a slightly larger mass and no charge with electrons having a negligible mass and a negative charge. Each atom has an atomic number which is the same as the number of protons in its nucleus: All atoms of the same element have the same number of protons in the nucleus, but some may have different numbers of neutrons in the nucleus and are called isotopes.

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The discovery of the radioactive properties of uranium in by Henri Becquerel subsequently revolutionized the way scientists measured the age of artifacts and supported the theory that Earth was considerably older than what some scientists believed. However, one of the most widely used and accepted method is radioactive dating. All radioactive dating is based on the fact that a radioactive substance, through its characteristic disintegration, eventually transmutes into a stable nuclide. When the rate of decay of a radioactive substance is known, the age of a specimen can be determined from the relative proportions of the remaining radioactive material and the product of its decay. In , the American chemist Bertram Boltwood demonstrated that he could determine the age of a rock containing uranium and thereby proved to the scientific community that radioactive dating was a reliable method.

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Measurement of N, the number of 14 C atoms currently in the sample, allows the calculation of t, the age of the sample, using the equation above. The above calculations make several assumptions, such as that the level of 14 C in the atmosphere has remained constant over time. The calculations involve several steps and include an intermediate value called the "radiocarbon age", which is the age in "radiocarbon years" of the sample: Radiocarbon ages are still calculated using this half-life, and are known as "Conventional Radiocarbon Age". Since the calibration curve IntCal also reports past atmospheric 14 C concentration using this conventional age, any conventional ages calibrated against the IntCal curve will produce a correct calibrated age.

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