Nitrogen 15 is an important isotope marker with broad prospects in scientific research and medical fields.

Nitrogen 15 (15N) is an isotope of nitrogen. In nature, natural nitrogen is composed of two stable isotopes, nitrogen 14 and nitrogen 15. Among them, the content of nitrogen 15 is 0.365%, which is a small proportion. Nitrogen 15 can be used as a marker compound and as a tracer atom for nitrogen compounds. It…