Neutrons from a research reactor can interact with atoms in a sample causing the emission of gamma rays which, when analysed for characteristic energies and intensity, will identify the types and quantities of elements present.Some radioisotopes used in nuclear medicine have very short half-lives, which means they decay quickly others with longer half-lives take more time to decay, which makes them suitable for therapeutic purposes.When they die no new carbon is taken in by the dead organism.The carbon it contained at sating time of death decays over a long radioisitopes of time.However, when an organism ceases to exist, it no carbon dating using radioisotopes takes in carbon from its environment and the unstable 14 C isotope begins to decay.From this science, we are able to approximate the date at dwting the organism were living on Earth.14 is used in the preparation of labelled compounds that form key diagnostic tools in medical.
33 Medical Applications Some radioisotopes have the ability to kill living tissue. Isotopes which are radioactive in nature are called radioisotopes.
The alpha particles pass between the two charged metal plates, causing air particles to ionise (split into positive and negative ions).
(The neutrons arise from alpha particles interacting with Be-9.
By measuring radioisotopees amount of carbon left in dead organic material the approximate time since it died can be worked out.
For example, intwo hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out. You're using the Internet Explorer 6 browser to view the BBC website. This page is best viewed in an up-to-date web browser with style sheets CSS enabled.