half – life all radioisotopes have a half life. the half is of any given radioisotope is the...
Post on 18-Jan-2016
215 Views
Preview:
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
# of half lives
Total Time elapse (HOW LONG)
Half – Life (can be found in table N)
80g 40g 20g10g
1 2 3
The sample above went through 3 half lives, meaning it was cut in half 3 times.
It is now 1/8 it’s original amount½ ½ ½ = 1/8
Sample Problem
288Ac has a half life of 6.13 hours. How much of a 60 mg sample would remain after 24.52 hours?# of half
lives24.52 HR
6.13 HR
60g 30g 15g7.5g 3.75g
1 2 3 4
3.5 g would remain
4So, 60 is
going to get cut in ½ 4
times
top related