Waikato university radiometric dating
The University of Waikato began in 1956 after Hamilton locals launched a petition for a university to serve the needs of the South Auckland region.The group was led by Douglas Seymour, a barrister, and subsequently Anthony "Rufus" Rogers, a Hamilton GP and brother to long-time Mayor of Hamilton, Denis Rogers.Because of the fairly fast decay rate of carbon-14, it can only be used on material up to about 60,000 years old.Geologists use radiocarbon to date such materials as wood and pollen trapped in sediment, which indicates the date of the sediment itself.The Law Faculty adopted the principles of professionalism, biculturalism and the study of law in context.One of the key founders of the Waikato Faculty of Law was the 27th Speaker of the House Margaret Wilson who returned The chief executive of the University of Waikato is the vice-chancellor, currently Professor Neil Quigley.Geologists often need to know the age of material that they find.They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.
Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.
The table below shows characteristics of some common radiometric dating methods.
Geologists choose a dating method that suits the materials available in their rocks. Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.
For example, the decay of potassium-40 to argon-40 is used to date rocks older than 20,000 years, and the decay of uranium-238 to lead-206 is used for rocks older than 1 million years.
Radiocarbon dating measures radioactive isotopes in once-living organic material instead of rock, using the decay of carbon-14 to nitrogen-14.