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I measured these three components behind a regular home window (same type of glass as a clear glass door or office window), a car windshield, and a carâs side window. Measurements were taken at three different times during the day: in the morning (9 amâââ10 am), early afternoon (1 pmâââ2pm), and late afternoon (5pmâââ6pm). Each of these recordings were made in accordance with the sunâs orientation (morning recordings were done with the window facing east, afternoon with window facing west)
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âFortunately, the amount of UV seeping through windows is small in comparison to outdoors. Unfortunately, however, there are not many places where we are deemed âsafeâ from UV radiation. Although the amount of UV coming through windows is small when compared to being outside, there is certainly no argument as to whether or not UV is seeping through.
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Home windows are generally made from double-layered soda-lime glass. While it is true these types of windows arenât capable of windshield-esque protection, they are capable of some protection.
The structural components of a microscope are used to hold and support the instrument and its parts. The optical components are used to magnify and view the images of the specimens.
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For those who are curious, the percentage of UVA v.s. UVB for a carâs side window and the home window was 57% t0 43%, respectively; the percentage of UVA v.s. UVB for a carâs windshield was 14% to 86%, respectively.
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âBelow is the data for the carâs 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.
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Even though UVB constitutes a small fraction (5%) of the total UV radiation, it has a higher impact on human health and needs to be weighted higher. We utilize the UV Index (UVI), which is the medically accepted medium for determining how UV rays affect our skin.
The problem, though, is that windshields only protect the front side of your face. The side window of your car is made out of a different type of glass (tempered glass). Tempered glass is known to block 60â70% of UVB rays, but not UVA.
Double-paned windows were chosen for this experiment not because of any UV-related connection; but rather, these windows are the most commonly found in homes and business around the world. As a result, it is almost certain that you may come into contact with these windows on a daily basis.
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These graphs help us conclude a few things about 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.
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On the same note, these results should be read with the correct context. 1pm is solar zenith (when the sun is strongest), 9am-10am is within a 3â4 hour window of that, whereas 5pm-6pm is within a 4â5 hour window of that. As a result, the sun is lower on the horizon for the afternoon readingsâââwhich may help explain why those results are so much lower than the others.
The optical components of the microscope are used to observe, enlarge, and generate an image from a sample put on a slide. These parts consist of the following:
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The lack of efficiency behind these side windows are the cause for many studies done 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 facesâââthe side exposed while driving.
Now that we have seen that UV radiation does in fact come through to us while driving, letâs see whether or not we are safe while at home or at work (with pictures of the windows used):
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As you can see, the windshield seems to be an effective medium blocking UV radiationâââwhich, in other words, means that you are generally safe while behind the wheel. It is important to note, however, that windshields are made from laminated glassâââa type unique to windshields. Laminated glass is made from laminated plastic between two layers of glass, which is known to block 98â99% of all UV light.
In case the midday recordings seem a bit out of place to youâ think about it: when the sun is at itâs peak (solar zenith), it is shining directly down on earth. As a result, there is not much sun coming directly through windows as the majority of the rays are hitting the top of the building you may be in.
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âUV radiation has three different components of varying wavelengths. These are UVA, UVB, and UVC; they decrease in length from âAâ to âCâ. UVC rays are absorbed by the atmosphere, and thus do not affect us. UVB rays only affect the top layer of our skin (epidermis), and are the cause of most sunburns. UVA rays account for 95% of the UV radiation on earthâs surface, and penetrate the second layer of our skin (dermis).
âTo determine how much ultraviolet radiation comes through the windows we spend our lives behind, a Shade sensor and a radiometer were used in order to accurately measure the UVA, UVB, and UVI (0â3 ft. away).