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activity）。大多數應用是基于使用13C作為標記，并且，用同位素比率質譜法（英语：Isotope-ratio mass spectrometry）（isotope-ratio mass spectrometer ，缩写"IRMS"）測定13C-12C的比例；一臺MS裝有一個特別設計
from Prunus Fruits by Gas Chromatography Combustion/Pyrolysis Isotope Ratio Mass Spectrometry (GC-C/P-IRMS). Journal of Agricultural and Food Chemistry.
苏斯效应
25-year-long dendrochronological study (1978-2002) using stable C isotope ratio mass spectrometry in growth rings of perennial trees from the Southern Atlantic
000种更多独特的分子组合物，研究小组估计陨石中可能存在数百万种不同的有机化合物 。 使用同位素质谱仪（英语：Isotope-ratio mass spectrometry）测量在默奇森陨石中发现的嘌呤和嘧啶的碳同位素比，脲嘧啶和黄嘌呤的δ13C分别是+44.5‰ and +37
(Hordeum vulgare) using inductively coupled plasma mass spectrometry, isotope-ratio mass spectrometry, and multivariate statistics. Analytical and Bioanalytical