Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence. The isochron method many radioactive dating methods are based on minute additions of daughter products to a rock or mineral in which a considerable amount of daughter-type isotopes already exists.
The uranium-lead method is the longest-used dating method it was first used in 1907, about a century ago the uranium-lead system is more complicated than other parent-daughter systems it is actually several dating methods put together. A zircon crystal is found to contain 3 times as much pb-207 (lead 207) as u-235 (uranium 235) crystals form with small amounts of uranium in them but without any lead in them the half-life for the decay of u-235 into pb-207 is 713 million years.
When someone mentions scientific dating methods, the first thing to come to mind for most people is carbon dating however, there are many methods that can be used to determine the age of the earth or other objects.
Uranium–lead dating, abbreviated u–pb dating, is one of the oldest and most refined of the radiometric dating schemes it can be used to date rocks that formed and crystallised  from about 1 million years to over 45 billion years ago with routine precisions in the 01–1 percent range. In this study we describe a method for uranium dating (ie determination of the date of the last chemical purification undergone by the material) by measurement of the 230th/234u ratio, applicable.
Absolute dating • any method of measuring the age of an event or object in years • radiometric dating (which uses the concept of radioactive decay) is the most common method of absolute dating • used to determine the age of rocks and fossils. A method for dating small amounts of uranium fabien pointurier • ame´lie hubert • gae¨lle roger received: 10 august 2012/published online: 26 september 2012 akade´miai kiado´, budapest, hungary 2012. Uranium-lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock as uranium decays radioactively, it becomes different chemical elements until it stops at lead.
Dating methods in archaeology absolute or scientific dating methods 1 radiocarbon or c-14 dating: it is known that may minerals and natural glasses (obsidian, tektites) contain very small quantities of uranium through time , the uranium undergoes a slow spontaneous process of decay.