Radioactivity 4 combined
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Mr Christodoulou
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10 Terms
Describe what happens to the number of unstable nuclei in a radioactive sample over time.
It decreases.
Define half-life in terms of activity
The time it takes for the activity of a sample to halve.
Define half-life in terms of number of unstable nuclei.
The time it takes for the number of unstable nuclei in a sample to halve.
Explain why irradiation is dangerous.
Exposure to radiation can lead to ionisation events.
Describe what happens to the number of stable nuclei in a radioactive sample over time.
It increases.
Define irradiation
The process of exposing an object to nuclear radiation.
Explain why radioactive contamination is dangerous
The contaminating radioactive atoms will decay, leading to irradiation.
Define radioactive contamination
The unwanted presence of materials containing radioactive atoms on other materials.
State whether irradiated objects become radioactive.
No, because their nuclei do not become unstable.
Describe what happens to the activity of a radioactive sample over time,
It decreases.
Note 
Flashcards (22)