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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (rā'dē-ō-mět'rĭk) A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it.For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium).Method implies a detailed, logically ordered plan: What method does your school use for teaching math?System suggests order, regularity, and coordination of methods: Our products have improved dramatically since we initiated a quality-control system.A 10 gram sample of U-238Now that has changed, and some important discoveries are being made.

The old friends play chess in the most serious fashion.If one knows how much of this radioactive material was present initially in the object (by determining how much of the material has decayed), and one knows the half-life of the material, one can deduce the age of the object.) is the time required for a quantity to reduce to half its initial value.Note the consequence of the law of large numbers: with more atoms, the overall decay is more regular and more predictable.Synonyms: method, system, routine, manner, fashion, mode, way These nouns refer to the plans or procedures followed to accomplish a task or attain a goal.Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation.