Extreme UVwavelength

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HighestUVindex in the world

Likewise, a small-leaf sparse-canopy gum tree does not provide nearly the same shade protection as a big old Moreton Bay fig.

Or you can be in the same place, in a cool breeze on a 22 degree summer's day at 1pm and get seriously burned due to the extreme UV index.

One challenge is that the UV Index was created last century largely for North American and European conditions. There the UVI rarely gets into the extreme range.

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Cancer Council's free SunSmart app provides up to the minute and projected UV levels, as well as useful information on how to stay SunSmart.

Extreme UVweather

UV radiation is separate from the visible and infrared parts of the spectrum, so you can't see or feel it. That means you can be at the cricket or the beach in summer at 5pm and feel hot but the UVI might be in the low range of 1 or 2.

The World Health Organisation recommends protecting our skin from the sun when the UVI is 3 or higher. So the "alert" applies to the block of time the UVI is 3 or above though the course of any day.

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Ultraviolet light is a form of radiation invisible to the human eye. Ultraviolet wavelengths of sunlight are made up of UVB, which has shorter wavelengths (of 290 to 320 nanometres) and higher energy, and UVA, which has longer wavelengths (320 to 400 nm) and lower energy.

As the wound heals and skin regrows, the treated area is smoother and tighter. Types of ablative lasers include carbon dioxide (CO2) lasers, erbium lasers and ...

Uvmeaning

Discover the importance of infrared light for understanding the universe, and how NASA's James Webb Space Telescope (JWST) will show infrared in ...

Alongside the day's high and low temperatures, weather reports generally contain a UV index for a particular time. But what does it actually mean - and what should you do about it?

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Extreme UVlithography

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Other classifications are moderate (3-5), high (6-7), very high (8-10) and extreme (11+). To some extent, the moderate to very high labels tell us little except that UV intensity is increasing. The most simple advice is that when the index is at 3 or higher, protect your skin. Hence the "alert".

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Sunscreen is proven effective to reduce skin cancer. But most of us do not use enough to reach the protection claimed on the label.

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A Fresnel lens is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a ...

It is estimated that 7220 cases of melanoma - 63% of the total number - in Australia in 2010 and all of the 750,000-plus non-melanoma skin cancers were due to exposure to our high-UV climate.

What is extreme uvrays

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UV radiation reflects off many surfaces including concrete, water and snow. Indirect UV (refracted by the atmosphere) can burn even if you are in the shade of a beach umbrella. If you can see lots of sky - even if you are in a little shade - chances are you are getting a pretty big dose of UV.

Finally, skin type is important. Those blessed with naturally dark skin (like Aboriginal people who have evolved in our climate) have inherited a lower skin cancer risk than those of us from northern European heritage with pale, easily burned and sun-sensitive outer casing.

UVIndexExtrememeaning

Shade cloth was originally invented for horticultural purposes and can be as low as an equivalent SPF of 3-4, but some offer more effective UV protection.

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To illustrate, today in Cairns the period when sun protection was needed was 8.10am to 4.10 pm, with a UV Index peak of 13 and extreme levels between about 10am and 2pm.

Extreme UVtoday

But there is a lot around to help. Being indoors provides great UV protection, even near the window (most office window glass gives very good UV protection).

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The Ultra Violet Radiation Index (UVI) has been around for more than 20 years and gives a measure of the intensity of the sun, using both UVA and UVB.

Both types of UV damage skin cells and both are thought to contribute to skin cancer. But UVB causes sunburn and UVA contributes more to ageing and penetrates deeper skin layers.

A rectangular prism is a three-dimensional shape, having six faces, where all the faces (top, bottom, and lateral faces) of the prism are rectangles such ...

In Australia, we spend most of the summer with "extreme" UV conditions in the middle of the day. There are concerns that the effect of the term "extreme" wears off if it is the norm. This will be one of the points debated at the International Conference on UV and Skin Cancer Protection in Melbourne this week.

A collection of the best Very.co.uk creative work, such as advertising, marketing campaigns and videos.

Summer clothing can vary from the crocheted bikini (not so good) to a close-knit cotton shirt and shorts or a flowing sundress. The fabric weave and coverage are the keys - and look for UPF50 (ultraviolet protection) ratings. The best thing about clothing is you can see exactly what is or is not protected.