Radiation
- Dangers
- Types of Radiation
- Radioactive Decay
- Created by: JudiWood
- Created on: 01-05-14 10:38
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- Radiation
- Types
- Alpha
- Not very dangerous outside the body as they can't penetrate through the skin
- Most dangerous inside the body because it is easily absorbed by cells.
- Beta
- Very dangerous outside the body as they can penetrate skin and harm the living cells inside.
- Not very dangerous inside the body as they are unlikely to be absorbed by living cells.
- Gamma
- Very dangerous if outside the body as they can penetrate skin and harm the living cells inside.
- Not very dangerous inside the body as they are unlikely to be absorbed by the living cells
- Positron
- Neutron
- Alpha
- All radiation has a charge, penetration and ionisation. These vary with the types of radiation.
- Radioactive Decay
- Atoms are made up of protons, neutrons and electrons.
- Every atoms has an equal number of positive protons and negative electrons, so there is no overall charge.
- Nuclei that are unstable split up in radioactive decay and emit radioactive radiation.
- Five types of radioactive radiation
- When there is too many or too few neutrons in the nucleus (compared to the proton number) the atom becomes unstable.
- These are called radioactive isotopes.
- Atoms are made up of protons, neutrons and electrons.
- Tumour Treatment
- High-powered Gamma rays are arranged in several weaker sources aroud the body to focus on the cancer cells.
- Radiation therapy can be given both externally and internally
- Gamma rays are strong enough to kill cancer cells as well as the normal, uncancerous cells so the targeting has to be precise.
- Dangers
- When radiaton collides with living particles, severe damage can be done
- If the nucleus DNA is damaged, the cell may become cancerous.
- The greater the dose of radiation that the lliving cell receives, the higher the chance of severe damage.
- Very high doses can kill cells completely - this can be used in medical treatment against cancer cells.
- When radiaton collides with living particles, severe damage can be done
- Types
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