Why Radiation is Harmful
This lesson covers:
- The meaning of the terms 'contamination' and 'irradiation'
- Why radiation is harmful to our DNA and cells
- The most and least harmful types of radiation
- Some of the safety precautions required when handling radioactive substances
Irradiation is the process by which objects are __________ radiation.
protected from
exposed to
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Which of the following are ionising radiation?
(Select all that apply)
Visible light
Gamma rays
Alpha particles
Microwave radiation
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Irradiation / Contamination
is when radioactive particles get onto your body or other objects.
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Infrared radiation
X-rays
Beta particles
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Which factors determine how harmful the radiation is?
(Select all that apply)
The type of radiation
The amount of radiation you receive
The amount of antioxidants in your body
Where you're exposed to the radiation
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What might happen if DNA is exposed to ionising radiation?
(Select all that apply)
The cell could divide uncontrollably and become cancerous
The DNA could become radioactive
The DNA could be destroyed
The DNA could mutate
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The above diagram shows radiation in order of harm, when the source of radiation is in close contact with your body.
Which radiation is out of place in the diagram?
Alpha radiation
X-ray radiation
Ultraviolet radiation
Infra-red radiation
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Four radioactive substances are on the table across the room from you. Which is the least harmful and why?
Alpha radiation because it can't penetrate very far in air
Gamma radiation because it's not very ionising
Alpha radiation because it's not very ionising
Beta radiation because it's not very ionising
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Which radioactive substance is the most harmful inside the body and why?
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What are the factors that affect the amount of radiation you receive?
(Select all that apply)
How far away from the source you are
How radioactive the substance is
How long you're exposed for
Whether you're in good or poor health
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What safety precautions can be taken when handling radioactive substances?
(Select all that apply)
Use tongs when picking up the radioactive substance
Wear overalls
Freeze the radioactive substance first
Store the radioactive substance in a lead-lined box
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True or false? Once you've become irradiated, you become radioactive and can emit radiation to others.
True
False
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