5
radiation protection excessive UV exposure appears
to be the most important environmental factor in
the development of skin cancer. International
Cancer Institutes have therefore placed UV radiation
on its list of known carcinogens. In addition to that
excessive UV radiation can damage the immune
system of the body. Therefore overexposure to the
sun is considered one main reason for premature
skin aging. UV rays have also been found to be
associated with cataracts.
For further information to this subject please
visit the website of your country’s Department of
Health.
Sunlight also has positive effects to our body, too.
So it stimulates the production of vitamin D which
is important to our immune system. Independently
most of us find it pleasing spending time in the
sun and would also find it unrealistic to be asked
to avoid it.
Therefore it is important for us to be aware that
excessive exposure is a risk and that we have
to learn how to protect ourselves against over-
exposure.
Factors causing variations in exposure
to UV radiation
At particular locations, at particular times of the
day or seasons, the UV radiation can vary:
Time of day
30% of the daily UV radiation reaches us at noon
between 11:00 a.m. and 01:00 p.m., when the sun
is the highest.
5 Appendix
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