The electromagnetic spectrum
Over-exposure to certain types of electromagnetic radiation can be harmful. The higher the frequency of the radiation, the more damage it is likely to cause to the body:
Microwave radiation can be used to transmit signals such as those for mobile phone calls. Microwave transmitters and receivers on buildings and masts communicate with the mobile phones in their range.
There is concern that microwave radiation from mobile phones and masts may be harmful to health.
You may wish to view this BBC news item (2006) about this issue.
Ultraviolet radiation - UV - is found naturally in sunlight. We cannot see or feel ultraviolet radiation, but our skin responds to it by turning darker. This happens as our bodies attempt to reduce the amount of ultraviolet radiation reaching deeper skin tissues. Darker skins absorb more ultraviolet light, so less ultraviolet radiation reaches the deeper tissues. This is important, because ultraviolet radiation can cause normal cells to become cancerous.
|UV C||high||causes severe damage to cells|
|UV B||medium||causes severe sunburn and damage to cells|
|UV A||low||weaker effects than UV B|
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