Carbon 13 is an excellent isotope marker and my country’s independent supply capability is expected to improve

Carbon 13 (13C) is one of the stable isotopes of carbon. It contains 6 protons and 7 neutrons in the nucleus. In nature, the carbon element mainly has two stable isotopes, carbon 12 and carbon 13. Among them, the carbon 12 content is about 98.89%, and the carbon 13 content is about 1.11%. Carbon 13…