1. Protecting Yourself from UV Radiation
SUN SAFETY
Protecting Yourself from UV Radiation
Oklahoma State University

2. Ultraviolet Radiation - UV
What is Ultraviolet Radiation?
Oklahoma State University

3. Ultraviolet Radiation - UV
The sun is the energy source that sustains all life on earth.
Ultraviolet Radiation (UV) is simply one form of energy coming from the sun.
Oklahoma State University

4. Ultraviolet Radiation - UV
Sunlight contains 3 types of UV rays…
Oklahoma State University

5. Ultraviolet Radiation - UV
UVA—causes skin aging & wrinkles. Used in tanning beds. Colors skin and gives false sense of protection from the sun. UVA rays pass effortlessly through the ozone layer.
Oklahoma State University

6. Ultraviolet Radiation - UV
UVB—causes sunburns, cataracts, immune system damage, skin cancer. Melanoma may be associated with severe UVB sunburns occurring before the age of 20. Most UVB rays are absorbed by the ozone layer.
Oklahoma State University

7. Ultraviolet Radiation - UV
UVC—these rays are the most dangerous. Fortunately, these rays are blocked by the ozone layer and don’t reach the earth.
Oklahoma State University

8. Ultraviolet Radiation - UV
Even on cloudy, cool, or overcast days, UV rays travel through the clouds and reflect off sand, water, snow, and even concrete.
Clouds and pollution don’t filter out UV rays, and can give a false sense of protection.
This “invisible sun” can cause unexpected sunburn and skin damage.
Oklahoma State University

9. Ultraviolet Radiation - UV
The sun’s light is strongest when it is highest in the sky (normally from 10 AM to 4 PM).
UV rays are strongest during the summer.
UV intensity is greater at high altitudes. Skiers need to take extra care.
Oklahoma State University

10. Ultraviolet Radiation - UV
The UV Index* predicts the next day’s UV levels on a scale.
*Developed by the National Weather Service and the EPA.
UV Index Number
Exposure Level
Minutes to Burn
0 to 2
Minimal 60
3 to 4
Low 45
5 to 6
Moderate 30
7 to 9
High 15
10+
Very high 10
Oklahoma State University

11. Effects of UV Exposure
Sunburn
Oklahoma State University

12. Effects of UV Exposure
Sunburn
Oklahoma State University

13. Effects of UV Exposure
Sunburn develops when the amount of UV exposure is greater than the protection your skin’s melanin can provide.
The lighter your skin, the less melanin it has to absorb UV and protect itself.
All skin, no matter the color, thickens and hardens with continued sun exposure, resulting in wrinkles later in life.
Oklahoma State University

14. Effects of UV Exposure
Eye Damage
Oklahoma State University

15. Effects of UV Exposure
Spending long hours in the sun with no eye protection may increase your chance of developing cataracts.
Even low amounts of sunlight can increase the risk of eye disorders.
UVB damage to the eyes is cumulative, so it is never too late to start protecting your eyes.
Oklahoma State University

16. Effects of UV Exposure
Skin Damage
Oklahoma State University

17. Effects of UV Exposure
There are about 1.3 million new cases of skin cancer in the U.S. each year, resulting in about 9,800 deaths.
Melanoma is one type of skin cancer. It is the most common cancer among women between the ages of 25 and 29.
Oklahoma State University

18. Effects of UV Exposure
Skin cancer is the most common of cancers and is largely preventable.
Increased outdoor leisure time, less clothing worn outdoors, and decreased ozone levels are partly to blame.
Oklahoma State University

19. Effects of UV Exposure
Compare the underside of your arm to the topside of your arm to see the effect of sun exposure on your skin.
“Sun damage” causes wrinkles, easy bruising, brown “liver” spots, and potentially, skin cancer.
Oklahoma State University

20. Effects of UV Exposure
Scientists believe sunburns can alter the body’s immune system for up to 24 hours after exposure to the sun.
Repeated overexposure to UV radiation can cause more damage to the body’s immune system, even in people with dark skin.
Oklahoma State University

21. Guidelines for Protection
Eye Protection
Oklahoma State University

22. Guidelines for Protection
Sunglasses offer excellent protection.
Make sure the lenses are designed to block out 95% of UV.
Polarizing lenses and mirror finishes reduce glare, but have little effect in blocking the absorption of UV rays.
Oklahoma State University

23. Guidelines for Protection
Tanning Protection
Oklahoma State University

24. Guidelines for Protection
Sunscreen doesn’t offer 100% protection.
SPF 30+ sunscreen blocks 96% of UV; SPF 15+ blocks out 93%.
In addition to sunscreen, wear a hat, sunglasses, more clothing, and seek shade.
Oklahoma State University

25. Guidelines for Protection
Using SPF 30+ instead of SPF 15+ does not mean you can safely double your time in the sun.
Apply sunscreen 20 minutes before going outside. Don’t rub it in—a light film should stay visible.
Oklahoma State University

26. Guidelines for Protection
Reapply sunscreen every 2 hours if you are swimming or sweating a lot.
Fragrances and moisturizers in sunscreen may cause allergic reaction; experiment with other brands if this is a problem.
Oklahoma State University

27. Guidelines for Protection
Protective Clothing
Oklahoma State University

28. Guidelines for Protection
Choose clothes that cover your arms, legs and neck to ensure proper protection.
You won’t get too hot or uncomfortable in lightweight fabrics like cotton, hemp or linen.
Oklahoma State University

29. Guidelines for Protection
Most cotton and cotton/polyester fabrics protect against 95% of UV, but are less effective if wet, faded, or aged.
Dark colors are better at absorbing UV than light colors.
If you choose to wear light colors, make sure the fabric is a tight weave, such as canvas.
Oklahoma State University

30. Guidelines for Protection
Appropriately designed clothing is great for protecting you from the sun.
Oklahoma State University

31. Sun Safety
Oklahoma State University