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.
Tritium AMS standard curve over the expected range of tree ring samples. Error bars for individual measurements are smaller than the data points. The instrument quantitation limit (5σ) was 70 TU, and sample preparation quantitation limit (5σ) was 5000 TU.
