2. Radiation is All around Us Sunlight is electromagnetic radiation High-energy wavelengths above ultraviolet are collectively called “ionizing radiation”

3. Sources of Ionizing Radiation Cosmic rays from space High-energy particles (protons) from the Sun and Exploding stars Uranium decay by-products from soil and rocks X-rays for dental and medical applications Background radiation is that which is naturally present in the environment.

4. Penetrating Power of Radioactive Particles When radioactive sources decompose they emit alpha and beta particles as well as gamma rays

5. Radioactive Decay Tritium Beta Decay Example

6. Half-life The time required for one-half of a given quantity of a radioactive substance to decay.

7. Radon Gas The heaviest gas: Colorless, Tasteless, Odorless Source: rock outcrops Can seep into homes and other structures Effect: Can increase risk of lung cancer

8. Vernier Student Radiation Monitor Principle of operation Uses and limitations

9. Radiation in the Dust Activity Data Capture Equipment Set-up Data Collection Data Analysis