This type of dating employs many dating techniques like atomic clocks, carbon dating, annual cycle methods, and trapped electron method. Thus, measuring the ratio of D to L in a sample enables one to estimate how long ago the specimen died. Careful sampling under dark conditions allows the sediment to be exposed to artificial light in the laboratory which releases the OSL signal. Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last. This light can be measured to determine the last time the item was heated. Though using similar methods, these two techniques differ in certain ways that will be discussed in this article. Scientists measure the proportion of carbon left in the organism to determine its age. Many factors can spoil the sample before testing as well, exposing the sample to heat or direct light may cause some of the electrons to dissipate, causing the item to date younger. Radioactive isotopes decay at a fixed rate. Once something dies, it ceases taking in new carbon, and the existing carbon within the organism decays into nitrogen at a fixed rate. Dendrochronology or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings.
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