Half-Life Skill Builder Sheet Init 10/19/2016 by Daniel R. Barnes Based on a previously-created worksheet

temperature time time triangle “change in time” = “time elapsed” = “time gone by” decay life short long

francium-223, astatine-210 uranium-238, potassium-40 random 50 50% 5730 potassium-40 50%

50% 50% decay 500 250 125 zero radioactive half-lives

    0.5 0.25     0.125 0.0625 12,000 y / 5730 y/HL = 2.09 HL 3 HL x 22 min/HL = 66 minutes 2100 My / 700 My/HL = 3 HL 7 HL x 12.32 y/HL = 86.24 y

12,000 y / 5730 y/HL = 2.09 HL  2 HL to make the math easy 1000 mg x (½)2 = 1000 mg x ¼ = 1000 mg x 0.25 = 250 mg 2 d x 24 h/d = 48 h 48 h / 8 h/HL = 6 HL (8.1  8) 64 g x (½)6 = 64 g x 1/64 = 64 g x 0.0156 = duh. 1 g. (64/64 = 1!) 40 kg / 2.5 kg = 16 = 24  4 half-lives 4 HL x 24,100 y/HL = 96,400 y