Ultraviolet Radiation

Definition

Ultraviolet (UV) radiation is a type of electromagnetic radiation that has a shorter wavelength than visible light but longer than X-rays. It is not visible to the human eye.

Sources of Ultraviolet Radiation

• The sun is the primary natural source of UV radiation.
• Artificial sources include tanning beds, mercury vapor lamps, and black lights.

Types of Ultraviolet Radiation

There are three main types of UV radiation:

1. UVA (long-wave UV)
2. UVB (medium-wave UV)
3. UVC (short-wave UV)

Effects on Health and Environment

UV radiation can have both positive and negative effects:

• Positive effects include the production of vitamin D in the skin and treatment of certain skin conditions.
• Negative effects include sunburn, premature skin aging, and an increased risk of skin cancer.
• UV radiation can also affect the environment by damaging DNA in plants and animals, and contributing to the formation of the ozone hole.

Protection from UV Radiation

To protect yourself from UV radiation, you can:

• Wear sunscreen with a high SPF
• Wear protective clothing and sunglasses
• Avoid prolonged exposure to the sun, especially during peak UV hours (10am to 4pm)

Study Tips

When studying ultraviolet radiation, make sure to:

• Understand the different types of UV radiation and their wavelengths
• Learn about the health effects of UV exposure and how to protect yourself
• Be familiar with the environmental impact of UV radiation
• Practice identifying sources of UV radiation in everyday life