PPT-Radioactive Decay

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. 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. True. False. Types of radioactive decay. Gamma. Beta (+,-, . e.c. .). Alpha. Neutron emission. Fission. Fusion. http://ie.lbl.gov/education/isotopes.htm. Gamma Decay. Nucleus in excited state gives off energy as a photon. . Chemistry. How does a nuclear reactor work?. http://www.lanl.gov/science/1663/images/reactor.jpg. How does a small mass contained in this bomb cause……. Nuclear Bomb of 1945 known as . “. fat man. Why are some elements (isotopes) more stable than others?. The Nucleus. The Electric Force. Protons hate Protons. Strong Force. Strong Force Facts. Neutrons act like cement. Strong Force is very strong over a small distance (about the distance of two protons). 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 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. FIGURE 01: Simple Bohr-type model of a lithium atom. Radioactive Isotopes. Unstable isotopes decay to other nuclides. The rate of decay is constant, and not affected by P, T, X…. Parent. nuclide = . 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 . Section 21.1 Types of Radioactivity. Objectives: Analyze Common Sources of Background Radiation, Compare and Contrast Alpha, Beta and Gamma Radiation, Apply the concept of Half-Life of a Radioactive Element. 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?. Commenwealth. of Massachusetts (Radiation Control Program), as specified by 105 CMR 120. . http://www.mass.gov/dph/rcp/radia.htm. . Copies of the license, active amendments, and relevant correspondence are maintained in the office of Clark’s Radiation Safety Officer, Dr. David L. Thurlow, . 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. .