{"id":"W4413451495","doi":"10.2139/ssrn.5402024","title":"Environmental Occurrence and Predictive Understanding of Polonium‑210 in Freshwater Environments","year":2025,"lang":"en","type":"preprint","venue":"SSRN Electronic Journal","topic":"Radioactive element chemistry and processing","field":"Chemistry","cited_by":0,"is_retracted":false,"has_abstract":false,"ca_institutions":"University of Ottawa; Canadian Nuclear Laboratories; Atomic Energy (Canada)","funders":"","keywords":"Polonium; Environmental science; Chemistry; Radiochemistry","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"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":[0.000228516,0.0001821694,0.0002144099,0.0005478739,0.0002305935,0.0007167927,0.0002613345,0.0003818024,0.0007704793],"category_scores_gemma":[0.0008376134,0.0002167779,0.0002037745,0.0008432869,0.0003447309,0.0006917067,0.0005624804,0.0002441709,0.0001570397],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0005015415,"about_ca_system_score_gemma":0.0004765679,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.01169428,"about_ca_topic_score_gemma":0.01079661,"domain_scores_codex":[0.9999071,0.00001298352,0.000006086885,0.0000415586,0.00001503818,0.00001722307],"domain_scores_gemma":[0.9997305,0.00009813778,0.00007233418,0.00002775412,0.00005465369,0.00001648045],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.0002175321,0.00003783228,0.8954036,0.0001349477,0.00009457642,0.0003646032,0.0002121665,0.06013062,0.02221993,0.00210882,0.0005474611,0.01852794],"study_design_scores_gemma":[0.00001195202,0.00009631497,0.8363523,0.00002952021,0.00006593685,0.0002065072,0.0007172257,0.1419714,0.01140617,0.006113051,0.002989552,0.00004003283],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9930511,0.0001289018,0.00401914,0.000082811,0.000006202804,0.000005772658,0.0008064712,0.00004897325,0.001850754],"genre_scores_gemma":[0.9990121,0.0001007573,0.0004516096,0.000007967868,0.000002282022,0.000001832256,0.0002553595,0.000007082997,0.0001609898],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.01169428,"threshold_uncertainty_score":0.02325243,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.01322342246835564,"score_gpt":0.2417194764725017,"score_spread":0.228496054004146,"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."}}