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Dose rate measurements with correlated U, Th and K uncertainties using full NaI:Tl gamma spectrum analysis

Gosek Maciej, Jędrzejowski Maksymilian, Poręba Grzegorz, Kłosok Kacper, Błachowicz Tomasz, Tudyka Konrad

Geochronometria

2025

Vol. 52, no. 1

1--11

This study introduces a new method for measuring uranium, thorium decay chains, and K-40 in geological materials using NaI:Tl gamma spectrometry. The novel approach involves fitting data to model reference spectra via custom software, processing full mixed spectra to estimate pure component spectra quantifying radionuclides contents and evaluating their correlations. These correlations are crucial in calculating environmental dose rates for trapped charge dating. The methodology was validated using a Canberra InSpector 1000 spectrometer, with results cross-checked against high-resolution gamma spectrometry. With the use of the μRate web application, dose rates uncertainties were lowered by including correlated inputs, which results in improved precision in trapped charge dating.

Accounting for Overcounting Induced by 222Rn Contamination in 14C Measurements Performed with Liquid Scintillation Counting

Jędrzejowski Maksymilian, Michczyńska Danuta J., Michczyński Adam, Kłusek Marzena, Tudyka Konrad

Geochronometria

2023

Vol. 50, no. 1

91--99

This research paper introduces a methodology for estimating overcounting resulting from uranium series radionuclides, with a specific focus on 222Rn contamination. The method is demonstrated using the Quantulus 1220TM spectrometer. Exponential fitting is employed for the calculations, utilizing a custom algorithm developed in MATLAB® R2022b. The proposed method allows for the determination of the sample count rate correction, F14C and radiocarbon age without the need for additional chemical treatment or specialized electronics during liquid scintillation counting (LSC) measurements with the Quantulus 1220TM spectrometer. However, the method does have certain limitations. It requires a significant number of cycles and extended measurement time per cycle, but it can be applied to samples with significant 222Rn contamination that require rapid 14C analysis.