What type of light causes the skin to tan?
UVA radiation is what makes people tan. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes (pronounced: mel-an-oh-sites) to produce melanin. Melanin is the brown pigment that causes tanning.
Does UVB or UVA cause cancer?
UVB rays are responsible for producing sunburn. The UVB rays also play the greatest role in causing skin cancers, including the deadly black mole form of skin cancer (malignant melanoma). UVA rays also play a role in skin cancer formation.
Which UV rays cause the majority of skin cancers?
UVB rays have slightly more energy than UVA rays. They can damage the DNA in skin cells directly, and are the main rays that cause sunburns. They are also thought to cause most skin cancers. UVC rays have more energy than the other types of UV rays.
How far does UV light penetrate skin?
Ultraviolet radiation can penetrate deeper into the skin at the volar side throughout the spectrum ( p<0.05 for 335–305 and 296nm , p<0.005 for 329–311 and 305nm ; one-tailed paired t-test).
Why is tan attractive?
non-tanned models. In other words, seeing tanned, attractive people encourages us to want the same for ourselves. Not surprisingly, a major motivating factor for tanning is that people want to improve their general appearance (Cafri et al., 2006).
Why is tanning good?
Several health benefit claims such as improved appearance, enhanced mood, and increased vitamin D levels have been attributed to tanning. Furthermore, the Indoor Tanning Association claims that “catching some rays may lengthen your life” . Exposure to sunlight has been linked to improved energy and elevated mood.
What is worse UVA or UVB?
UVA rays can penetrate your skin more deeply and cause your skin cells to age prematurely. … The other 5 percent of UV rays are UVB. They have higher energy levels than UVA rays, and typically damage the outermost layers of your skin, causing sunburn. These rays directly damage DNA and are the cause of most skin cancers.
Are tanning beds UVA or UVB?
Tanning beds use UVA light, which penetrates the skin more deeply than UVB rays. So tanning beds can cause just as much — if not more — damage as the sun. Plus, the concentration of UVA rays from a tanning bed is greater than the amount of UVA rays a person gets from the sun.
What type of radiation in sunlight causes damage to DNA?
The routine and often unavoidable exposure to solar ultraviolet (UV) radiation makes it one of the most significant environmental DNA-damaging agents to which humans are exposed. Sunlight, specifically UVB and UVA, triggers various types of DNA damage.