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The equation

Half – Life All radioisotopes have a half life. The half is of any given radioisotope is the amount of time required for one half (50%) of the sample to decay. The equation. Total Time elapse (HOW LONG). # of half lives. Half – Life (can be found in table N). 2. 1. 3.

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The equation

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  1. Half – LifeAll radioisotopes have a half life. The half is of any given radioisotope is the amount of time required for one half (50%) of the sample to decay

  2. The equation Total Time elapse (HOW LONG) # of half lives Half – Life (can be found in table N) 2 1 3 80g 40g 20g 10g The sample above went through 3 half lives, meaning it was cut in half 3 times. It is now 1/8 it’s original amount ½ ½ ½ = 1/8

  3. Sample Problem # of half lives 288Ac has a half life of 6.13 hours. How much of a 60 mg sample would remain after 24.52 hours? So, 60 is going to get cut in ½ 4 times 24.52 HR 4 6.13 HR 2 1 3 4 60g 30g 15g 7.5g 3.75g 3.5 g would remain

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