Radioactivity - Protection against radiation

7 important questions on Radioactivity - Protection against radiation

What do you see when you look at the penetrating power?

That the types of radiation are totally different from each other. One type of radiation can penetrate substances much more deeply than another type of radiation

What is the penetrating power of the alpha radiation?

It cannot penetrate deeply into substances. Just a sheet of paper or some centimeters of air can stop alpha particles.

What is the penetrating power of beta radiation?

It penetrates further than alpha radiation. The particles are much smaller. It is stopped by a 4 mm thick plate of aluminium or by a thin glass plate
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What is the penetrating power of gamma radiation?

Gamma radiation consists of waves that propagate at the speed of light. These waves are very penetrating. They are hardly absorbed by air and even a metal plate stops only little gamma radiation.

What is (external) irradiation?

If a radioactive substance source isn't shielded well, ionising radiation can reach your body from the outside.

What is radioactive contamination?

When radioactive substances land on your skin

To which rules should people who work with radioactive sources always stick?

  • Make sure the distance from the source is as large as possible
  • make sure that the time for which you are irradiated is as short as possible
  • use shielding material that absorbs the radiation

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