We perform a systematic and detailed study of the 14 C and 14 C‐ 10 Be dating systems for meteorite terrestrial ages. Physical model calculations indicate that neither the 14 C production rates nor the 14 C/ 10 Be production rate ratios are constant enough to be reasonably approximated by average values. By using simple averages, one introduces a significant size‐dependent bias into the database for meteorite terrestrial ages. By combining modeled 14 C production rates and 14 C/ 10 Be production rate ratios with ( 22 Ne/ 21 Ne) cos ratios and assuming ~80% ablation losses, relatively easy to use correlations of 14 C production rates and 14 C/ 10 Be production rate ratios as a function of ( 22 Ne/ 21 Ne) cos are established. The new correlations enable the determination of terrestrial ages that are more accurate than ages based solely on average values for 14 C and/or 14 C/ 10 Be. We validate the model predictions by measuring 14 C activity concentrations, 14 C/ 10 Be production rate ratios, 21 Ne cos concentrations, and ( 22 Ne/ 21 Ne) cos ratios in four recently fallen meteorites: Mt. Tazerzait, Boumdeid (2011), Bensour, and SaU 606. The experimental data confirmed the model predictions, although the available data are insufficient to be conclusive. More data from freshly fallen meteorites are needed for validating the model predictions for different chondrite sizes and chondrite types.