Isotope ratio mass spectrometry is a technique used to measure isotope ratios to infer origin or processing. Which is a common forensic application?

Isotope ratio mass spectrometry is a technique used to measure isotope ratios to infer origin or processing. Which is a common forensic application?

• A. Dating artifacts via radiometric methods.
• B. Sourcing drugs or determining geographic origin of materials.
• C. Identifying DNA sequences.
• D. Determining the color of unknown substances.

Answer: (B)

Isotope ratio mass spectrometry measures stable isotope ratios because those ratios capture the environmental and processing history of a material. The isotopic fingerprint—things like carbon, hydrogen, nitrogen, oxygen, and sulfur isotope ratios—varies with geography, climate, water sources, geology, and production methods. That makes IRMS a powerful tool for tracing where a substance comes from or how it was made. In forensic contexts, a common application is sourcing drugs or determining the geographic origin of materials. By comparing a sample’s isotope ratios to reference signatures from different regions or production pathways, analysts can infer where the material likely originated or how it was processed, which is valuable for linking evidence to a source or uncovering missing supply chains. DNA sequencing, by contrast, relies on analyzing genetic material rather than isotopic composition. Determining color is mainly about pigments and chemical structure rather than isotope ratios. Radiometric dating uses radioactive decay, not the stable isotope ratios IRMS measures, so its goals and methods differ from isotope-based provenance analysis.

Isotope ratio mass spectrometry measures stable isotope ratios because those ratios capture the environmental and processing history of a material. The isotopic fingerprint—things like carbon, hydrogen, nitrogen, oxygen, and sulfur isotope ratios—varies with geography, climate, water sources, geology, and production methods. That makes IRMS a powerful tool for tracing where a substance comes from or how it was made.

In forensic contexts, a common application is sourcing drugs or determining the geographic origin of materials. By comparing a sample’s isotope ratios to reference signatures from different regions or production pathways, analysts can infer where the material likely originated or how it was processed, which is valuable for linking evidence to a source or uncovering missing supply chains.

DNA sequencing, by contrast, relies on analyzing genetic material rather than isotopic composition. Determining color is mainly about pigments and chemical structure rather than isotope ratios. Radiometric dating uses radioactive decay, not the stable isotope ratios IRMS measures, so its goals and methods differ from isotope-based provenance analysis.