12. Are rays from the sun the same as rays from a sunbed? |
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Sunlight reaching earth after a trip through the stratosphere and atmosphere has changed in composition. The ozone layer, for example, filters
out part of the most harmful components of UV-rays. UV-C and part of UV-B is filtered out, while UV-A remains essentially the same. But the reception of solar rays depend on a large number of other influential factors, too, such as the season, the location on earth (degree of latitude), the height in relation to sea level, time of the day, local climate, air pollution and the reflection of, for example, beach, water and snow. Because of these factors, the dose of UV-rays that reaches us varies from day to day. The thinning ozone layer also plays a role: an increasing amount of harmful UV-rays reach us through holes in this natural filter. When you view the natural sun in this light, it is a rather unreliable tanning source, which furthermore does not have a timer. Exposure to UV-rays in a sunbed can be accurately dosed. More importantly there are no distorting factors that play a role here. The lamps of the sunbed emit UV-rays that are in no way inferior to rays from the natural sun, with the exception of the percentage of the UV-B and UV-A that has been predetermined by the tube manufacturer. |
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