Radioactive decay and absolute dating Mature adult dating nl

In 1898 the Polish-French physicist team of Marie Sklodowska Curie (1867-1934) and her husband Pierre (1859-1906) discovered that thorium also gave off radiation.

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The French physicist Antoine Henri Becquerel (1852-1908) wondered if X rays might be among the energy given off by fluorescent materials.

In 1896 Becquerel discovered that potassium uranyl sulfate (K2UO2 (SO4)2 did create energy that penetrated black paper to expose photographic film.

Furthermore, this energy could penetrate cardboard and even walls to fluoresce barium platinocyanide.

Rontgen used the mathematical symbol for unknown to name this energy X-rays.

First, the decay of what we now call the parent isotope is exponential.

Furthermore, the formation of the daughter isotope is exponential and inverse to the parent decay.

They also discovered that compounds containing U and Th emitted more radiation than either element by itself.

The Curies deduced that other radioactive elements must be present, which led to their discovery of the elements polonium and radium (Dalrymple, 1991, p 69).

Wilhelm Konrad Rontgen (1845-1923) published a report in 1895, which described his discovery of a mysterious source of energy emitted by a cathode ray tube.

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