Radioactive materials are all around us. Some are beneficial, while others may cause us harm. In this lesson you'll learn what radioactive materials are and explore where they come from and how. Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.. The method was developed in the late 1940s by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960. It is based on the fact that radiocarbon (14 Radioactive contamination, also called radiological contamination, is the deposition of, or presence of radioactive substances on surfaces or within solids, liquids or gases (including the human body), where their presence is unintended or undesirable (from the International Atomic Energy Agency - IAEA - definition).. Such contamination presents a hazard because of the radioactive decay of the. We’re going to see what 'half-life' means and why radioactivity changes with time. We’ll also see how carbon dating can be used to date ancient remains. Dating definition, a particular month, day, and year at which some event happened or will happen: July 4, 1776 was the date of the signing of the Declaration of Independence. See more. In this lesson, we'll go over the definition of radioactive elements. We'll learn about the different types of particles emitted during the process of radiation and look at some examples of. Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that originated from living organisms. An age could be estimated by measuring the amount of carbon-14 present in the sample and comparing this against an internationally used reference standard. This lesson simulates radioactive decay to develop the understanding of what we mean by half-life. The older a sample of a radioactive material, the less radioactive it is. The decrease in radioactivity follows a characteristic pattern shown in the graph or decay curve.. The y axis can represent the % radioisotope left OR the measured radioactivity. Radioactivity: Radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei. Radioactive decay is a property of several naturally occurring elements as well as of artificially produced isotopes of the elements.