Meaning
Radioactive isotope dating relies on the decay rate of carbon 14 to determine the age of organic material. Atoms of this isotope occur naturally in the atmosphere and enter biological cycles until the organism dies. Once life ceases, the lack of intake triggers a measurable decline in atomic concentration.
The half-life of 5730 years allows labs to calculate how long ago an organism stopped exchanging gases with its environment.
Polymer Dating
Injection moulding operations verify the age of bio-based resins by measuring the ratio of stable carbon isotopes against carbon 14 within the feedstock. This analytical process confirms whether a material is genuinely derived from contemporary plant matter or synthetic fossil fuels. Manufacturers apply this test to ensure regulatory compliance for claims regarding sustainable content.
A discrepancy between the measured isotope levels and the technical specification indicates the inclusion of non-renewable additives.
Production Variability
Process temperature fluctuations change how additives behave during the melt phase in a barrel. Contamination from regrind batches introduces fossil-derived carbon that dilutes the organic signature of virgin pellets. High levels of fossil carbon in a polymer melt shift the isotopic profile away from the expected threshold.
Tooling setup requires exact control to prevent cross-contamination that skews these results.
Verification Standards
Standard protocols dictate the sample preparation needed for liquid scintillation counting or accelerator mass spectrometry. Analysts isolate pure carbon from the polymer matrix through combustion to remove surface impurities. The final data set provides a quantitative measure of the bio-based carbon fraction present in a sample.
Proper calibration of the mass spectrometer removes background noise from the results. Internal accuracy depends on the precision of the equipment used during the counting process.
