{"id":"W1993717009","doi":"10.1002/rcm.3940","title":"How well do we know VPDB? Variability of <i>δ</i> <sup>13</sup> C and <i>δ</i> <sup>18</sup> O in CO <sub>2</sub> generated from NBS19‐calcite","year":2009,"lang":"en","type":"article","venue":"Rapid Communications in Mass Spectrometry","topic":"Atmospheric and Environmental Gas Dynamics","field":"Environmental Science","cited_by":53,"is_retracted":false,"has_abstract":true,"ca_institutions":"Environment and Climate Change Canada","funders":"Max-Planck-Gesellschaft","keywords":"Calcite; Chemistry; Isotope; Homogeneous; Stable isotope ratio; Isotopes of carbon; Isotopes of oxygen; Carbon fibers; Consistency (knowledge bases); Mineralogy; Analytical Chemistry (journal); Environmental chemistry; Total organic carbon; Nuclear chemistry; Thermodynamics","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":true,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.00610701,0.0004771991,0.0009259215,0.00208609,0.0008997297,0.006155602,0.001302493,0.001520281,0.007098622],"category_scores_gemma":[0.03750437,0.0004350792,0.0003349012,0.002686066,0.002674462,0.01253259,0.001895018,0.002196424,0.004627638],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.001870986,"about_ca_system_score_gemma":0.001566717,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.01580463,"about_ca_topic_score_gemma":0.01137849,"domain_scores_codex":[0.9976168,0.0006987388,0.0001629642,0.0008747206,0.0004088071,0.0002380425],"domain_scores_gemma":[0.9774982,0.0100286,0.003147789,0.001867444,0.005355221,0.002102851],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"design_other","study_design_gemma":"bench_or_experimental","study_design_scores_codex":[0.0001865433,0.0001695864,0.349039,0.0006886845,0.0004671984,0.000251231,0.005138167,0.001745543,0.001119927,0.01754278,0.04056437,0.5830869],"study_design_scores_gemma":[0.00003839176,0.0003875331,0.4310485,0.00239842,0.0003938052,0.001468561,0.02412317,0.007959289,0.003039175,0.2052965,0.3235668,0.0002799387],"study_design_candidate":"bench_or_experimental","study_design_consensus":null,"genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.56533,0.1063232,0.04580434,0.162135,0.002419836,0.00008745935,0.01372525,0.0008282369,0.1033467],"genre_scores_gemma":[0.945169,0.01996232,0.008209435,0.01698854,0.001223434,0.00008969594,0.003097247,0.0002500096,0.005010291],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.01580463,"threshold_uncertainty_score":0.03229737,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.009305682806542526,"score_gpt":0.220792361676275,"score_spread":0.2114866788697324,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}