Dating techniques are procedures used by scientists to determine the age of rocks, fossils, or artifacts. Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide an approximate date in years. The latter have generally been available only since Many absolute dating techniques take advantage of radioactive decay , whereby a radioactive form of an element decays into a non-radioactive product at a regular rate. Others, such as amino acid racimization and cation-ratio dating, are based on chemical changes in the organic or inorganic composition of a sample. In recent years, a few of these methods have come under close scrutiny as scientists strive to develop the most accurate dating techniques possible.
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The oldest extant complete text survives in a Greek translation called the Septuagint , dating to the 4th century CE Codex Sinaiticus. The oldest extant manuscripts of the vocalized Masoretic Text the basis of modern editions , date to the 9th century CE. Internal evidence in the texts suggests dating the individual books of the book New Testament canon in the 1st century CE. The first book written was probably 1 Thessalonians , written around 50 CE. Since the original recording of the scriptures, various scribes have made numerous copies of the written originals, which are no longer extant. Copies have been made of those copies, resulting in several text types. Archaeologists have recovered about 5, New Testament manuscripts : either fragments or complete books.
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