This species corresponds to the 45 peak when quantifying it using IRMS. Polarization is transferred onto this species to determine its chemical identity in a technique called DEPT. This is the lighter (-5[1])of two species whose concentration is diluted in the Suess effect. The use of this isotope's concentration (-5[2])to detect (-5[1])synthetic testosterone, adulterated (-5[1])food, and infer prehistoric diets (15[1])comes from its different isotopic signatures (-5[1])in C3 and C4 (*) photosynthesis. Chemical shifts between 0 (10[1])and 220 ppm are detected in a form of NMR (10[1])using (10[2])this isotope, (10[8])the second (10[1])most-common (10[1])form after (-5[1])proton NMR. (-5[1])This stable isotope's natural ratio is 1.1%, (10[1])and has one fewer neutron than (10[1])a radioactive isotope (-5[1])with a half-life (10[1])of 5700 years. (10[2]-5[2])For 10 points, name this isotope of Carbon (10[1]-5[1])that has seven (10[1])neutrons. (10[3])■END■ (10[8]0[1])