1. Electromagnetic waves
5.2 Gamma rays and X-rays

2. Learning outcomes
Be able to describe the properties of gamma and x-rays
Understand the uses and dangers of these waves

3. Research assignment Prepare a information booklet
General information on waves and the electromagnetic spectrum
Detailed sections on:
Gamma, X-ray, Ultraviolet, Visible light, Infra red, microwaves, radio waves
Will be judged by rest of class
Intro from Mr P
4-5 lessons to complete

4. EM Radiation: Uses: Dangers:
Gamma
Kills harmful bacteria in food, sterilising surgical equipment, killing cancer cells.
High doses can kill cells. Lower doses can cause cells to become cancerous.

5. EM Radiation: Uses: Dangers:
X rays
How do hospital workers limit their exposure to Gamma and X rays?
Shadow pictures of luggage and inside the human body.
Hospital workers limit exposure to Gamma and X rays by standing behind lead shields or by leaving the room when the radiations are being used.
High doses can kill cells. Lower doses can cause cells to become cancerous.

6. How are X-ray images formed?
X rays can penetrate soft tissue but not b_____. X rays are a_______ more by some materials than others. P________ f____ is used to detect X rays.
one
bsorbed
hotographic
ilm

7. Back scatter