Half Lifes.docx

Half Lifes.docx - Half Life How much time it takes for half...

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Half- Life - How much time it takes for half the nuclear material to decay 64g U -238 100 years. How much U -238 will be present in 100 years? Mass (g) Time (years) 64 0 32 100 16 200 8 300 4 400 2 500 1 600 .5 700 .25 800 .125 900 .0625 1000 300mg X half-life= 30 seconds How long will it take until I only have 9.375mg of X left? Mass (mg) Time (sec.) 300 0 150 30 75 60 37.5 90 18.75 120 9.375 150 100g Y In 72 days, I will have only 1.56g Y left. What is the half-life of Y? Mass (g) Half-Life’s 100 0 50 1 25 2 12.5 3 6.25 4 3.125 5 1.56 6 72/6 = Each half life is 12 days.

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Decay Series- How to get to a stable isotope Alpha 280 111 Rg 4 2 He + 276 109 Mt Alpha 276 109 Mt 4 2 He + 272 107 Bh Beta 272 107 Bh 0 -1 e + 272 108 Hs Alpha 272 108 Hs 4 2 He + 268 106 Sg Stable Isotopes (maybe not)

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