May 15 – 20, 2022
Casino Conference Centre
Europe/Prague timezone

Determination of radiocarbon activity in mixed diet via indirect measurements

May 20, 2022, 10:30 AM
Marble Hall

Marble Hall

Verbal Radionuclides in the Environment, Radioecology Environmental Radioactivity


Michal Fejgl (SÚRO)


This contribution describes an alternative mean how to perform monitoring of 14C activity in mix diet via indirect measurements, i.e. via analyses of other sample kinds with carbon isotopic composition linked to the radiocarbon composition of the individual diet.
This research was launched due the European Commission Recommendation 2000/473/Euratom, requesting monitoring of 14C activity in a sparse network in a mixed diet. This kind of monitoring is not being performed yet in the Czech Republic. Aim of the research was to find a simple and effective procedure, how to perform determination 14C activity in the mixed diet.
Monitoring of 14C activity in mixed diets by sampling and analysing the mixed diet itself appears impractical due to inhomogeneity if such kind of samples. There are different types of samples, various kinds of human skin derivatives, that reliably represent the carbon isotope composition of the human mixed diet. Such samples, allowing uncomplicated sampling, are naturally robust against inhomogeneity and easy to analyse.
Human hair were chosen as an ideal type of sample for this purpose. A preliminary monitoring of 14C activity in mixed diet was performed simultaneously by both direct and indirect measurements.
Our contribution will contain summarization of yielded results, evaluation of the relation between the composition of mixed diet and human hair, and proposals, how to exploit reached knowledge for practical 14C in mixed diet monitoring.

Primary authors

Ivo Světlík (Nuclear Physics Institute AS CR) Michal Fejgl (SÚRO)

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