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UV exposure
In September, Eric Greenwell started a thread on UV exposure and how
much canopies absorbed. I bought one of the Oregon Scientific units he recommended (Amazon has a good price, roughly $20, esp if you buy something else to get over $25 for free shipping. I have not yet had a chance to try it out under my canopy, but I just did a test under a white cotton T shirt. The SPF factor seems to be almost infinite! Pointed at the sun, the meter said 28 minutes was the safe exposure time for the settings I have on it (SPF=1, moderate skin). Put under my T shirt, pointed in the same direction, and pulling the shirt tight to make it as transluscent as possible (as in moving around) gave a reading of 3959 minutes which is the maximum it will display. The SPF based on these readings seems to be well over 100, not the 10 that someone else suggested on that thread. The shirt is laundered normally, without the special product that poster mentioned to increase SPF. I realize this is just one reading, and there may be other factors (comments please), but the reading is consistent with my experience. When flying, I use SPF 30 sun screen with titanium or magnesium dioxide (the only kind my dermatologist says really works) on all exposed areas, but do not apply it under my T shirt except around the edges, where it will move and provide partial exposure. I never get even tan where the shirt covers in spite of no sun screen. Martin |
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