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Issue Date
2011-07
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[Erythemogenic UV rays].Citation
Læknablaðið 2011, 97 (7-8):417-20Abstract
The UV-index is an international standard measurement of the strength of erythemogenic ultraviolet radiation. It is often published in the media and then refers to the highest expected UV radiation for that day. The highest UV-index value measured in Iceland is seven. Although this is similar to the maximum values from southern Scandinavia, the average UV-index is lower in Iceland compared to other Nordic countries. Around solar noon the UV index is roughly equivalent to the Standard Erythema Dose (SED). During a bright summer day in Iceland the number of Standard Erythema doses can go as high as 32, but is on average in June around twenty. The typical Icelander gets red after 4-6 SED and it is obvious that during solar noon it is easy to sunburn in Iceland if you stay outside without sun protection.Útfjólublár stuðull er alþjóðleg skilgreining sem segir til um styrk útfjólublárra geisla. Gildi hans er oft birt í fjölmiðlum og segir þá til um hæsta gildi sem búist er við þann daginn. Hæsta gildi sem mælst hefur á Íslandi er rúmlega sjö. Þrátt fyrir að þetta sé svipað og í Danmörku er útfjólublár stuðull þó að jafnaði lægri á Íslandi. Um hádegisbil er útfjólublár stuðull nánast jafn fjölda staðlaðra roðaskammta á klukkustund. Á heiðskírum íslenskum sumardegi hafa mælst allt að 32 staðlaðir roðaskammtar, en í júní er meðalgildið 20 á dag. Húð flestra Íslendinga roðnar við fjóra til sex staðlaða roðaskammta þannig að mjög stuttan tíma þarf til þess að húðin roðni ef verið er úti án þess að nota sólvörn, sérstaklega í kringum hádegið.
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