Are you asking about radiocarbon dating?
http://en.wikipedia.org/wiki/Radiocarbon_dating
http://en.wikipedia.org/wiki/Radiocarbon_dating
http://en.wikipedia.org/wiki/Carbon
http://www.eia.doe.gov/environment.html
1. Start by conducting an internet search using keywords such as "history of carbon dating" or "first carbon dating."
2. Look for reliable sources such as scientific articles, research papers, or museum websites that document the development of carbon dating.
3. Explore the search results and click on credible sources that provide historical information about carbon dating.
4. Read the information provided in these sources, paying attention to details about the first successful carbon dating experiments or the pioneers in the field of radiocarbon dating.
5. Look for specific dates and names associated with the first carbon dating experiments, which will help you determine when it first took place.
By following these steps, you will be able to find the answer to your question about when the first carbon dating took place.