PPT-EQ: What is radioactive decay?

Unscramble the following keywords for todays lesson Yecad Iriaovadect Ootspei Nsteruon nadgit Isotopes When the nucleus of an atom possesses either too many or too few neutrons compared to the number of protons it becomes unstable These are called radioactive isotopes Unstable nuclei split up in a process called radioactive decay and emit radioactive radiation. The purpose of this experiment is . to use first-order nuclear decay kinetics to determine the half-life of a nuclear reaction.. Smoke Detectors. Americium-241. Smoke from a fire can be detected at a very early stage. Radioactivity. Science Park HS -- Honors Chemistry. Early Pioneers in Radioactivity. Roentgen:. Discoverer of X-rays 1895. Becquerel:. Discoverer of Radioactivity 1896. The Curies:. Discoverers of Radium and Polonium 1900-1908. Jim Hartnett. PHYS 3305. Radioactive Decay - Jim Hartnett. 1. What is it?. Macroscopic Effects. Types of Decay. The Decay Chain. Fission. Radioactive Decay - Jim Hartnett. 2. Radioactive Decay. A nucleus may be bound in a relatively high energy state, and if it can attain a lower energy, it will eventually do so. Background Image courtesy of Dr. Bill Moore, Dept. of Radiology, Stony Brook Hospital. http://www.colin-studholme.net/research/ipag/mrdspect/mrspect3.html. http://www.mwit.ac.th/~Physicslab/applet_04/atom2/Alphae.gif. some atoms are unstable. …occasionally emitting particles. from nucleus to become more stable. (radioactivity). this changes the atom. into a different type of . atom (parent element. decays to daughter element). Lecture . 9. Absolute Dating of the Earth. Major Concepts. The discovery of radioactivity in the early 1900’s and the recognition that . radioactive deca. y . (a statistical event) . occurs at a constant average rate for particular unstable isotopes has provided a means of determining the absolute ages of earth materials. Lecture 9. Absolute Dating of the Earth. Major Concepts. The discovery of radioactivity in the early 1900’s and the recognition that . radioactive decay . (a statistical event) occurs at a constant average rate for particular unstable isotopes has provided a means of determining the absolute ages of earth materials. Chart of the Nuclides. General Layout. Each nuclide occupies a square in a grid where. Atomic number (Z) is plotted vertically. Number of neutrons (N) is plotted horizontally. Heavily bordered square at left side of each row gives. When sedimentary rock is deposited in layers it is deposited horizontally.. Scientists use this “Principle of Original Horizontality” to help them determine the age of the layers.. The older layers of rock are found below the younger layers of rock.. 1. THE EARTH THROUGH TIME. TENTH EDITION. H A R O L D L. L E V I N. Chapter 3. Time and . Geology . Finding the age of rocks:. Relative versus Actual Dating . The . science that deals with determining the ages of rocks is called . adioactivity is a part of nature Everyatoms are unstable that is they have toomuch energy When radioactive atoms spon-taneously release their extra energy they areeventually though they do not all dec to use first-order nuclear decay kinetics to determine the half-life of a nuclear reaction.. Smoke Detectors. Americium-241. Smoke from a fire can be detected at a very early stage. Where might we see radioactive materials in everyday life?. I can:. -recognize the meaning of radioactive. . -recognize . that through radioactive decay, the unstable nucleus emits radiation in the form of very fast-moving particles and energy to produce a new nucleus, thus changing the identity of the element and nuclei that undergo this process are said to be radioactive. . Where: . A . = Activity after some time t.. A. o. . = Original activity of the sample.. t . = Decay time . λ = the radioactive decay constant equal to . The half-life equation can be also used for activity, simply by replacing the number of atoms .