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Skip Navigation LinksKCC Home > Academic Departments > Biological Sciences > 11New > Webpages > Union 3, Lesson 3

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Anatomy and Physiology I
Unit 1: Introduction to Human Anatomy and PhysiologyExpand Unit 1: Introduction to Human Anatomy and Physiology
Unit 2: The Cell and It’s EnvironmentExpand Unit 2: The Cell and It’s Environment
Unit 3: Cellular ChemistryExpand Unit 3: Cellular Chemistry
Unit 4: Biomolecules, Cell Architecture and Cellular Molecular FunctionExpand Unit 4: Biomolecules, Cell  Architecture and Cellular Molecular Function
Unit 5: Tissues, Membranes and GlandsExpand Unit 5: Tissues, Membranes and Glands
Unit 6: Integumentary SystemExpand Unit 6: Integumentary System
Unit 7: Skeletal System
Unit 8: Muscular System
Unit 9: Nervous System Introductory Concepts
Unit 10: The Central Nervous System - The Spinal Cord
Unit 11: The Central Nervous System - The Brain
Unit 12: The Autonomic Nervous System and Smooth Muscle

Lesson 3 - Isotopes and Radioactivity

Student Performance Objectives
1. Define nuclear decay, nuclear stability and half-life.
2. Draw the Bohr models for hydrogen, deuterium and tritium.
3. Define biological half-life and background radiation.
4. Explain the difference in ionizing radiation exposure when a simple x-ray, an angiogram or
    magnetic resonance imaging (MRI) is used in a medical imaging procedure.


Lesson Outline
Lesson Outline
A. Concept of ionizing radiation, sources and atomic nuclear stability.
    1. Nuclear decay 
        http://en.wikipedia.org/wiki/Radioactive_decay
    
2. Medical applications. See
        
http://www.who.int/ionizing_radiation/en/ or
       
 http://www.who.int/ionizing_radiation/about/what_is_ir/en/

B. Diagram hydrogen, deuterium and tritium. See
       
 http://www.colorado.edu/physics/2000/isotopes/
C. Radioisotopes and half-life.
    1. Physical half-life - time for 50% of atoms to decay to more stable
        forms. See
       
 http://www.colorado.edu/physics/2000/isotopes/radioactive_decay3.html
    2. Biological half-life - time for half to disappear from the human body
        generally through excretion.
D. Practical considerations
    1. Background radiation from the sun and outer space.
    2. Medical sources from dental and chest X-rays, CT scans.
    3. Compare ionizing radiation to MRI's, sonograms, and thermograms.
    4. Consider angiograms - one such motion picture X-ray procedure exposes one to the
        equivalent of thousands of chest X-rays.







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