Estimation of
26Al (half-life = 705 kyr) content at the time of meteorite fall is required to calculate the terrestrial age of meteorites using the
26Al content. Previous studies (e.g., Cressy, 1971; Hampel
et al., 1980) provided empirical equations for the estimation of
26Al content in meteorites at the time of meteorite fall. However, the equations overestimate the
26Al content of howardites and eucrites, which have a high Al content (5-8%). In this study, we present a new simple empirical equation based on the relationship between
26Al content and the content of two main target elements, Al and Si, in 37 falls meteorites from various classes (one howardite, 10 eucrites, 13 diogenites, 8 chondrites, 3 ureilites, and one angrite). The equation estimates the
26Al content of howardites and eucrites at the time of meteorite fall within a 9% difference of the measured
26Al content. This difference is lower than in any other equations presented in previous literature.
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