E F G 5 Experiment 3 - Shielding H K L M 7 Alpha particles (radon-222) Beta Particle Shielding Activity (counts/s) 100 10 No shielding 260 80 11 1 mm cardboard 0 12 1 mm aluminum 0 60 + Cardboard Activity (counts/s) Aluminum 13 1 mm lead 0 40 Lead 14 15 Beta particles (iron-59) 20 16 Activity (counts/s) 17 Thickness (mm) Cardboard Aluminum Lead 0 18 0 79 79 79 0 1 2 3 5 19 32 7 0 Thickness of Shielding (mm) 20 2 16 5 0 Gamma Ray Shielding 21 3 6 2 0 50 22 A 2 0 0 40 23 24 Gamma rays (strontium-85) (counts/s) 30 Cardboard 25 Activity (counts/s) AluminumA B C D Thickness (mm) E F Cardboard G Alumi H Lead K L M 0 79 0 79 79 0 2 3 4 5 32 7 0 Thickness of Shielding (mm) 2 16 5 0 Gamma Ray Shielding 3 6 2 0 50 4 2 0 0 40 Gamma rays (strontium-85) 30 Activity (counts/s) Cardboard Activity (counts/s) Thickness (mm) Cardboard Aluminum Lead Aluminum 20 Lead 0 39 39 39 39 39 32 10 2 39 38 28 0 3 39 36 22 0 1 2 3 4 5 6 A 38 35 18 Thickness of Shielding (mm)