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Lecture_29_112211

# Lecture_29_112211 - Lecture 29 Radioactivity Goals Describe...

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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, 4.33

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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
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
Types of Radiation Alpha ( α ) particle is two protons and two neutrons Beta ( β ) particle is a high-energy electron Positron ( β + ) is a positive electron Gamma ( γ ) ray is high-energy released from a nucleus

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Radiation Protection Radiation protection requires – paper and clothing for alpha particles
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Lecture_29_112211 - Lecture 29 Radioactivity Goals Describe...

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