UV Radiation

UVA, UVB, and UVC

• UVC is stopped by our atmosphere
• UVB is stopped in the surface layers of skin
• UVA penetrates to the deeper layers of the skin

Summary of Methods

• UVA and UVB sensors from Vernier
• Data points are automatically taken every 4 seconds
• ~40 seconds per trial, per item, averaged = that day's UV block
• All days data points averaged together

Hypothesis 1

Percent UVA Blocked

Percent UVB Blocked

Hypthesis 2

Percent UVA Blocked

Percent UVB Blocked

Hypothesis 3

Percent UVA Blocked

Percent UVB Blocked

Conclusions

• Wear sun protection!
• Sunblock application matters more than SPF
• Type of material matters more than color
• The darker the lenses, the more effective the sunglasses