Figure 1.
Shortest time to reach the exposure limit of 30 J m‐ 2 (t UV) of area exposure (a) and handheld devices (b) assessed at 200 mm.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.