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Inside an ionization detector is a small amount (perhaps 1/5000th of a gram) of americium-241.
The radioactive element americium has a half-life of 432 years, and is a good source of alpha particles.
Ionization smoke detectors use an ionization chamber and a source of ionizing radiation to detect smoke.
This type of smoke detector is more common because it is inexpensive and better at detecting the smaller amounts of smoke produced by flaming fires.
One gram of of the element radium generates approximately 1 curie of activity (Marie Curie, the woman after whom the curie is named, did much of her research using radium).
Food irradiation is a method of treating food in order to make it safer to eat and have a longer shelf life.
Cross-dating of sites, comparing geologic strata at one site with another location and extrapolating the relative ages in that manner, is still an important dating strategy used today, primarily when sites are far too old for absolute dates to have much meaning.For example, JJA Worsaae used this law to prove the Three Age System.For more information on stratigraphy and how it is used in archaeology, see the Stratigraphy glossary entry.Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.