An artifact classified as wood, Bristlecone pine, found in a site at Tree ring, USA, is found to have a 14C radioactivity of 0.182 counts per second per gram of carbon. Living carbon-containing objects have an activity of 0.255 counts per second per gram of carbon. How long ago did the living carbon-containing source for the artifact die?
The half-life of 14C is 5730 years.