Radiation Types Basics
IGCSE Edexcel Physics
7.2-7.6 Radiation Types
Key Concepts:
Alpha, beta, and gamma have different ionizing and penetrating powers.
Section A: Properties
1. State the composition and charge of alpha, beta and gamma radiation.
[6]
2. Describe the penetration of alpha, beta and gamma radiation.
[3]
Section B: Practical
3. Describe a method to compare the penetration of alpha, beta and gamma radiation.
[4]
Total marks: 13
Mark Scheme
1.
Alpha: helium nucleus, +2; beta: electron, -1; gamma: EM wave, 0 [6]
2.
Alpha stopped by paper; beta by aluminum; gamma needs thick lead/concrete [3]
3.
Use source, detector, absorbers; measure count rate; compare penetration [4]