Lesson Three showed that unstable isotopes emit energy as they become more stable. This energy is known as radiation. This lesson explores forms of radiation, where radiation is found, how we detect and measure radiation, what sources of radiation people are exposed to, whether radiation is harmful, and how we can limit our exposure.

Specific topics covered in this lesson include:

  • Types of radiation
    • Non-ionizing
    • Ionizing
  • Forms of ionizing radiation
    • Alpha particles
    • Beta particles
    • Gamma rays
  • Radiation
    • Decay chain
    • Half-life
    • Dose
  • Radiation measurements
  • Sources of radiation
  • Average annual exposure