Radon-222 Iron-59 Strontium-85 Alpha (a) Beta (6) Gamma (y) Phosphorous- emitter emitter emitter 32 (?) emitter Counts Per Counts Per Counts Per Counts Per Second (CPS) Second (CPS) P Second (CPS) Second (CPS) No shielding 280 80 40 Paper 480 200 Cardboard (1 mm) 30 40 Aluminum (1 mm) Lead Which material provides the best shielding against alpha particles? Against beta particles? Against Gamma rays? Based on the data you collected, would you say that Phosphorous-32 is an alpha, beta, or gamma emitter? Explain your answer. Part 2: Effect of Shielding Thickness A A 20.30