The equation

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# The equation - PowerPoint PPT Presentation

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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Presentation Transcript

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

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

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