Ground Based Measurements of Solar UV Index in Tabriz | ||
| Iranian Journal of Medical Physics | ||
| مقاله 189، دوره 15، Special Issue-12th. Iranian Congress of Medical Physics، بهمن و اسفند 2018، صفحه 189-189 | ||
| نوع مقاله: Conference Proceedings | ||
| شناسه دیجیتال (DOI): 10.22038/ijmp.2018.12806 | ||
| نویسندگان | ||
| Reza Malekzadeh1؛ Parinaz Mehnati2؛ Hadi Sabri3؛ Reza Meynagi Zadeh Zargar2؛ Mahak Osuli* 4 | ||
| 1Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran | ||
| 2Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran | ||
| 3Department of Physics, University of Tabriz, Tabriz, Iran | ||
| 4Department of Medical Physics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran | ||
| چکیده | ||
| Introduction: Ultraviolet index (UVI) is a dimensionless scale, which describes the maximum intensity and biologic effects of UV during a specific time, on surface of the earth. The UVI is an international standard measurement of the strength of sunburn producing ultraviolet radiation at a particular place and time. This index is an easy and understandable concept for protection and application for people, which can be described: 2 or less means low exposure, 3-5 means average, 6-7 means high, 8-10 means very high and more than that means dangerous. The major approach is to calculate UVI by measuring the intensity of UV exposure on the surface of earth. In this study we calculated the UVI at Tabriz, based on the measurement of UV intensity. Materials and Methods: First, the amounts of UV type A and B by handheld lux UV-IR meter, for a whole year from sunrise to sunset were measured in Tabriz during 2016-2017. We use the following formula to calculate UVI: UVI k er ò E l .w(l)d (l) (1-1) 400 250 ìw(l ) = 1.........................250 < l < 298 ï 0.094 ( 298 - l ) íw(l ) = 10 ..........298 < l < 328 (1-2) ïw(l ) = 100.015 (139 - l )..........328 < l < 400 î In which Eλ is the intensity of the specific wavelength reaching the earth, ω(λ) is the biological effect of the specific wavelength and Ker is a constant which is 40 m2/W. Results: Our results showed that the maximum UVI occurs between 12 and 13 o'clock. Maximum and minimum Data was obtained in May and January respectively. For the summer and spring months, the amount of UVI is more than 10 in the 12 to 15 hours. In Just two month of the year, UVI is less that average, even in noon. Conclusion: Except for winter, UV exposure is high in noon (12 to 15 o'clock) and we recommend avoiding the direct sun exposures. | ||
| کلیدواژهها | ||
| Solar radiation Ultraviolet index Skin synthesis of vitamin D Radiation Protection | ||
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