Metals, Plastics, Fertilisers, Nuclear Chemistry Worksheet - National 5 Unit 3 Page 13
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13Exercise 12
1. Carbon-14 is a radioisotope. Copy and complete the nuclear equation to show it’s
decay:
a) Some carbon-14 is present naturally in the atmosphere. What name is given to
radiation from a source like this?
b) Carbon-14 is used in radiocarbon dating to find the age of archaeological
remains such as wood. Suggest 2 reasons why carbon-14 is suitable for this
purpose.
2. Albert has been given 16g of a radioactive isotope for his 12
th
birthday. The
isotope has a half-life of 8 years.
a) What is meant by the term half-life?
b) What mass of the isotope will Albert have when he is 20?
c) How old will Albert be when he has 2g of the isotope left?
3. A radioisotope has a half-life of 1 hour. What percentage of the isotope will remain
after 3 hours?
4. After 180 seconds the count rate from a radioisotope dropped from 512 counts per
minute to 8 counts per minute. Calculate the half-life of the radioisotope.
5. The radioactivity of a different radioisotope was measured over a period of time.
a) Use the data below to draw a graph of time versus counts per second.
Time (s)
0
5
10
15
25
30
42
60
Counts per sec
90
75
61
50
36
29
21
10
b) From the graph, calculate the half-life of the radio isotope.
13
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