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.
In 1905 Rutherford suggested that radioactive decay could be used as a method to calculate absolute time.
Early attempts at using radiometric dating are referred to as “chemical ages”.
The Curies found that the radiation was proportional to the Uranium content of the compound.
This indicated that radioactivity was a property of atoms, not molecules.
The phenomenon of emitting penetrating, ionizing radiation was given the name radioactivity by the Curies.With time, radiometric dating became more sophisticated and accurate, by 1931 radiometric dating had proven to be the credible method for determining the age of igneous rocks. For a good discussion on modern radiometric methods see 1. Radiometric Dating-Measuring the passage of time by the regular rate of decay of radioactive isotopes. Isotopes-Same element, but different number of neutrons. Some isotopes are stable and others are radioactive. Parent Isotope-Radioactive isotope incorporated during crystal formation. Daughter Isotope-Stable decay product of parent isotope. Radioactive isotopes decay or change into a stable element at an exponential rate that does not change. The decay rate is not affected by heat, temperature, pressure, or chemical reactions. Half-life-The time it takes for half of the parent sample to decay to the stable daughter isotope.