GB/T 29649-2013Determining the biobased content of biobased materials - Liquid scintillation counters (LSC) method (English PDF)

3.1 Bio-based materials

The use of biomass as a feedstock in the manufacture of new materials and chemicals, including bio-based plastics, bio-based chemicals, sugar, engineering products, and

Renewable biological resources such as grains, legumes, cotton and straw and wood cellulose and other biomass as a raw material or plastic composite materials.

3.2 Fossil carbon

Substantially free of radioactive carbon-carbon, which is much larger than the half-life of 14C ages (5730 years).

3.3 Modern carbon

Modern carbon. 1959 International Conference confirmed the US National Bureau of Standards developed by oxalic acid (SRM4990b) as the standard modern carbon

Quality, and its 1950 95% of the radioactivity of carbon as a modern standard radioactivity.

3.4 Biobased Content

Organic carbon per gram of sample radioactivity and modern carbon per gram of organic carbon in the reference material radioactivity ratio percentage. Meaning it represents

Si sample is the percentage of renewable resources of modern organic carbon total organic carbon, rather than a percentage of the total mass of the sample.

3.5 The efficiency of counting efficiency

The number of observations or measurements to count the results of the measurement period and the occurrence of decay activity rates, expressed as a percentage.

Principle 4

Upon the death of a living organism, it will stop the intake of new carbon. All organisms died twelve carbon isotope (12C) and Radiocarbon apposition […]