Lecture_29_112211 - Lecture 29: Radioactivity Goals:...

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Lecture 29: Radioactivity Goals: Describe alpha, beta, positron and gamma radiation. Write equations showing mass numbers and atomic numbers for radioactive decay. Describe the detection and measurement of radiation. Calculate the amount of radioisotope remaining after one or more half-lives Outline (Timberlake 4.1-4.4): ± Natural Radioactivity (4.1) ± Nuclear Reactions (4.2) ± Radiation Measurements (4.3) ± Half-Life of a Radioisotope (4.4) Problems for Extra Practice: 4.1, 4.3, 4.5, 4.7, 4.9, 4.13, 4.15, 4.17, 4.19, 4.21, 4.23, 4.25, 4.31, .33
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Nuclear Symbol X A Z X = Atomic symbol of the element A = The mass number (protons plus neutrons: A = Z + N ) Z = The atomic number: the number of protons in the nucleus (All atoms of the same element have the same # of protons.) N = The number of neutrons in the nucleus N = A - Z Isotopes = atoms of an element with the same number of protons, but different number of neutrons in the nucleus The Nuclear Symbol of the Atom
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Radioactive Isotopes A radioactive isotope • has an unstable nucleus • emits radiation to become more stable • can be one or more of the isotopes of an element
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Nuclear Radiation Nuclear radiation • is the radiation emitted by an unstable atom • takes the form of alpha particles, neutrons, beta particles, positrons, or gamma rays
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Types of Radiation • Alpha ( α ) particle is two protons and two neutrons • Beta ( β ) particle is a high-energy electron • Positron ( + ) is a positive electron • Gamma ( γ ) ray is high-energy released from a nucleus
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Radiation Protection Radiation protection requires
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_29_112211 - Lecture 29: Radioactivity Goals:...

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