How To Stop Uv Rays Through Windows

Context

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UV radiation has three different components of varying wavelengths. These are UVA, UVB, and UVC; they decrease in length from 'A' to 'C'. UVC rays are captivated by the temper, and thus do non touch us. UVB rays simply touch the elevation layer of our skin (epidermis), and are the crusade of most sunburns. UVA rays business relationship for 95% of the UV radiation on globe's surface, and penetrate the 2nd layer of our skin (dermis).

Even though UVB constitutes a small fraction (5%) of the total UV radiation, it has a college impact on human wellness and needs to exist weighted higher. Nosotros utilize the UV Index (UVI), which is the medically accepted medium for determining how UV rays bear on our pare.

Experiment

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To make up one's mind how much ultraviolet radiation comes through the windows we spend our lives behind, a Shade sensor and a radiometer were used in gild to accurately measure out the UVA, UVB, and UVI (0–iii ft. away).

I measured these 3 components behind a regular home window (same blazon of glass as a clear glass door or office window), a machine windshield, and a motorcar's side window. Measurements were taken at three different times during the twenty-four hours: in the morning (ix am — 10 am), early afternoon (one pm — 2pm), and tardily afternoon (5pm — 6pm). Each of these recordings were made in accord with the sun'south orientation (morning time recordings were done with the window facing east, afternoon with window facing west)

Results

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Below is the data for the motorcar'due south detected UVI (along with pictures of the windows themselves). The results were condensed into one graph as a means to compare the UV coming through.

Equally you can see, the windshield seems to be an constructive medium blocking UV radiation — which, in other words, means that you are generally prophylactic while behind the wheel. Information technology is important to note, all the same, that windshields are fabricated from laminated glass — a type unique to windshields. Laminated glass is made from laminated plastic between ii layers of glass, which is known to block 98–99% of all UV light.

The problem, though, is that windshields only protect the forepart side of your confront. The side window of your car is made out of a dissimilar type of glass (tempered glass). Tempered glass is known to block 60–70% of UVB rays, just not UVA.

The lack of efficiency backside these side windows are the cause for many studies washed in which it was concluded that people who had spent a lot of time driving a car were more likely to develop skin cancers on the left sides of their bodies and faces — the side exposed while driving.

At present that we have seen that UV radiations does in fact come through to us while driving, let'south meet whether or non nosotros are safe while at dwelling house or at piece of work (with pictures of the windows used):

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Domicile windows are generally made from double-layered soda-lime glass. While it is true these types of windows aren't capable of windshield-esque protection, they are capable of some protection.

Double-paned windows were chosen for this experiment non because of any UV-related connection; only rather, these windows are the most unremarkably establish in homes and business around the world. Equally a effect, information technology is nigh certain that you lot may come up into contact with these windows on a daily footing.

In case the midday recordings seem a scrap out of place to you— think nigh information technology: when the dominicus is at it's peak (solar zenith), it is shining straight downward on world. As a result, there is non much sun coming directly through windows as the majority of the rays are hitting the top of the building you may be in.

On the same notation, these results should be read with the right context. 1pm is solar zenith (when the sun is strongest), 9am-10am is within a iii–4 hour window of that, whereas 5pm-6pm is within a 4–5 hour window of that. Every bit a result, the sun is lower on the horizon for the afternoon readings — which may assistance explain why those results are so much lower than the others.

For those who are curious, the percentage of UVA 5.s. UVB for a car'south side window and the home window was 57% t0 43%, respectively; the percentage of UVA v.south. UVB for a car'south windshield was xiv% to 86%, respectively.

What does all of this mean?

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Fortunately, the amount of UV seeping through windows is small in comparing to outdoors. Unfortunately, however, in that location are not many places where we are deemed "safe" from UV radiations. Although the amount of UV coming through windows is pocket-size when compared to being outside, there is certainly no argument as to whether or not UV is seeping through.

These graphs help us conclude a few things nigh our safety in regards to UV radiation, but namely allow us to conclude that windowpanes are not UV blockers/filters; even the windshield let in some UV radiation.

What Tin We Do?

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In lodge to maximize your prophylactic, in that location are several different approaches:

Look for "full spectrum" sunscreen, which protects you from both UVA and UVB rays.
Wait into UV filters, which have the power to block out up to 99.nine% of rays emitted.
In the same vein as above, window-tints are a valid method of UV protection.
Switch positions every once in a while to ensure that not all of the exposure is effecting the same side.
If yous are going to be behind the bike for extended periods of time, consider applying sunscreen.

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If you are going to be backside the wheel for extended periods of time, consider applying sunscreen.

Source: https://www.wearshade.com/articles/uv-radiation-through-windows

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