Radiocarbon, an international journal of radiocarbon and other isotope dating In a study of the mutational landscape of p53 - immunopositive patches (PIPs), which may represent early squamous cell carcinoma precursors in the skin (myintimcity.com)
there are a number of other isotopes that can be used to accurately date the Earth. (religion.blogs.cnn.com)
FYI, beyond the limits for carbon there are other isotopes with longer half - lives used for measurements. (religion.blogs.cnn.com)