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1. Define the term half life
The half-life of a radioactive isotope is the time it takes for the number of nuclei of the isotope in a sample to halve.Â
or
The time it takes for the count rate (or activity) from a sample containing the isotope to fall to half its initial level.
2. Which radioactive source Iodine-131 or Cobalt-60 is likely to emit more radiation over a 1 day time period?
Iodine-131 as it has a shorter half life
3. Radioactive waste stays radioactive for tens of thousands of years, suggest why.
The waste contains a radioactive isotope with a long half life, so it decays over a long time period
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Absorption and Emission of EM Radiation
JJ Thomson and Plum pudding model
Ernest Rutherford and the Nuclear Model
Niels Bohr changing the Nuclear Model
Discovering the Proton and Neutron
Measuring radiation from radioactivity
Radiation types and properties
Random nature of radioactive decay
Radioactive contamination or irradiation
Hazards of contamination and irradiation
Studies on the effects of radiation on humans