On April 26, China's first domestic mass production of carbon-14 was launched in Qinshan nuclear power plant of China Nuclear Power Group. The production uses the internal nuclear reaction of commercial nuclear power units, which can produce carbon-14 in a long-term, stable and large amount Carbon-14 is an isotope of carbon, which is widely used in agriculture, chemistry, medicine, biology and other fields, such as the diagnosis of Helicobacter pylori, haze detection, drug research and development and so on.