Sample quality index to preselect suitable carbonate samples for alpha spectrometry U/Th dating

Area of Science:

• Geochemistry
• Radiometric Dating
• Analytical Chemistry

Background:

• Accurate radiometric dating is essential for geological and archaeological studies.
• Alpha spectrometry is a common technique for dating samples.
• The accuracy of alpha spectrometry relies on the assumption of a closed system and the absence of external thorium-232 (²³²Th).

Purpose of the Study:

• To identify petrological and chemical variables for pre-selecting suitable samples for alpha spectrometry dating.
• To develop a sample quality index for improved dating accuracy.

Main Methods:

• Thorough characterization of geological samples.
• Identification of key petrological and chemical indicators.
• Calculation of a sample quality index based on identified variables.

Main Results:

• Specific petrological and chemical variables that influence sample suitability for dating have been identified.
• A method for calculating a sample quality index has been established.
• The pre-selection process enhances the reliability of alpha spectrometry results.

Conclusions:

• The careful selection of samples based on identified petrological and chemical criteria is fundamental for accurate alpha spectrometry dating.
• The developed sample quality index provides a quantitative measure to improve the reliability of dating results.
• This approach minimizes errors associated with allochthonous thorium-232 contamination and open-system behavior.