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RADIATION FROM THE SUN 1 OZONE LAYER CATEGORY WAVELENGTHS (nanometres) REACTIONS IN & WITH STRATOSPHERE EFFECT UPON HUMANS, PLANTS ETC. UV-A: 315/320 - 400 nm Not significantly absorbed by the stratospheric ozone layer. 10-15% of ‘burning’: possible connection with the formation of skin cancers. Responsible for 'tanning' & skin ageing. UV-B: 280 – 315/320 nm Absorbed by ozone in the stratosphere. Ozone absorbs UV radiation without being reduced; the overall result being to convert UV radiation to heat. 85 – 90 % ‘burning’; involved with both malignant & benign cancerous growths. Also linked to eye cataracts. Effects on growth of plants and marine life. Strong radiation kills also plankton in the water which is the main food supply for fishes. UV-C: 200 - 280 nm Highly absorbed by oxygen molecules: involved with formation of ozone. Not thought to be significant, mainly because of its efficient absorption at high-altitudes. Figure 1.2. Radiation from the sun DUV OraysNareEdangerous to human beings, animals and plants because they burn. They can penetrate our skin and eyes and weaken our bodies’ immune system. That is why we should avoid long periods in the sun. To get the minimum daily dose of vitamin D only 15 minutes in the sun per day is enough. If we stay more than that, we might get sunburnt if no protection is used. Repeated sunburns and frequent tanning can cause premature ageing of the skin and, at worst, skin cancer such as melanoma (because of UV-A and UV-B). For the eyes the UV-B rays can cause a cataract (clouding of the eye lens). Most of the serious health problems appear only many years later. 19 UV-B UV-A EARTH Environmental ImpactPDF Image | Manual for Refrigeration Servicing Technicians
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