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|Source |Visible |Are we exposed |Are they dangerous |Is it ionising/ non- |
| | | | |ionising |
|Alpha | | |Yes, Alpha particles |ionising |
| | | |are very dangerous if | |
| | | |inhaled or ingested. | |
| | | |They can cause organ | |
| | | |and tissue damage | |
| | | |since they have great | |
| | | |ionizing potential. | |
| | | |For example, "they | |
| | | |throw bowling balls" | |
| | | |at the body’s | |
| | | |molecules, DNA, | |
| | | |tissue, etc. which can| |
| | | |cause radiation | |
| | | |poisoning and | |
| | | |sickness. | |
|Beta | | |Yes, It is capable of |ionising |
| | | |penetrating much | |
| | | |deeper into living | |
| | | |matter. Contact with a| |
| | | |living cell, is likely| |
| | | |to damage some of the | |
| | | |chemical links between| |
| | | |the living molecules | |
| | | |of the cell or cause | |
| | | |some permanent genetic| |
| | | |change in the cell | |
| | | |nucleus. If the damage| |
| | | |occurs within the | |
| | | |generative cells of | |
| | | |the ovaries or testes,| |
| | | |the damage may be | |
| | | |passed to new | |
| | | |generations. | |
|Gamma | | |Yes, they are very |ionising |
| | | |dangerous. They are | |
| | | |highly penetrative. | |
| | | |They can penetrate | |
| | | |through any gap, even | |
| | | |a subatomic one. They | |
| | | |can cause many | |
| | | |problems to humans and| |
| | | |animals as they have | |
| | | |very high frequencies | |
| | | |and hence very high | |
| | | |energies. Gamma rays | |
| | | |have the highest | |
| | | |frequencies of all the| |
| | | |EM waves (and hence | |
| | | |the shortest | |
| | | |wavelength and the | |
| | | |high penetration). | |
| | | |Some can cause severe | |
| | | |problems like DNA | |
| | | |alterations and even | |
| | | |cancer. | |
|Cosmic Radiation | | |No, Cosmic radiation |ionising |
| | | |is a collection of | |
| | | |many different types | |
| | | |of radiation from many| |
| | | |different types of | |
| | | |sources. When people | |
| | | |speak simply of | |
| | | |'cosmic radiation' | |
| | | |they are usually | |
| | | |referring specifically| |
| | | |to the cosmic | |
| | | |microwave background | |
| | | |radiation. The | |
| | | |particles that do make| |
| | | |it to the earth | |
| | | |interact with our | |
| | | |atmosphere, which acts| |
| | | |as a 'radiation | |
| | | |shield.' The | |
| | | |high-energy cosmic | |
| | | |rays bombard us all | |
| | | |the time, but they | |
| | | |interact quickly, | |
| | | |producing particles of| |
| | | |much lower energy | |
| | | |which impact the earth| |
| | | |harmlessly. If this | |
| | | |was dangerous to us, | |
| | | |we wouldn't be here to| |
| | | |discuss these things! | |
|U-V Radiation | | |Yes, Ultra-violet |Non-ionising |
| | | |energy is dangerous to| |
| | | |some extent because | |
| | | |ultraviolet is emitted| |
| | | |from the sun it is a | |
| | | |type of energy that if| |
| | | |humans are and were | |
| | | |exposed to, there is | |
| | | |some benefactors and | |
| | | |dangers like for | |
| | | |example. Some sunlight| |
| | | |is good for the body | |
| | | |because the U-V | |
| | | |radiation gives off | |
| | | |vitamin D however too | |
| | | |much of it and it can | |
| | | |cause health problems | |
| | | |for like for example | |
| | | |sunburns and also | |
| | | |cancer which is | |
| | | |usually detected | |
| | | |through what is called| |
| | | |a “sun spot”. | |
|Infra-Red | | |No, in small |Non-ionising |
|Radiation | | |quantities it’s very | |
| | | |beneficial i.e. | |
| | | |infra-red saunas | |
| | | |however an excessive | |
| | | |amount can be harmful | |
| | | |to the skin. | |

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