{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.lutetium","code":"thing-q1857","url":"https://ver.cy/models/thing/q1857/","name":"lutetium","alternateNames":["lutetium-151","lutetium-150","lutetium-150m","lutetium-151m","lutetium-152","lutetium-153","lutetium-153m1","lutetium-153m2","lutetium-153m3","lutetium-154","lutetium-154m1","lutetium-154m2"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The chemical element with atomic number seventy-one, the last of the lanthanide series, a silvery-white rare earth metal that is among the scarcest and most expensive of the rare earths, with one stable and one very long-lived isotope used in dating, and radioactive isotopes such as lutetium-177 used in targeted radionuclide therapy; lutetium is used in catalysts, scintillator crystals for medical imaging and research, and is obtained from rare earth ores.","purpose":"Let an agent explain lutetium as an element and its properties, describe uses including medical isotopes and scintillators, explain its role in geochronology, and support learning.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Rarest stable rare earth","Lutetium-hafnium dating","Medical isotope","Scintillator use"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What lutetium is.","layers":[{"id":"element","name":"Element","description":"The element.","findings":[{"id":"element-finding","name":"Element","description":"Element.","questions":[{"text":"What are the properties of lutetium, and how does it fit the lanthanide series?","kind":"definition"},{"text":"Which entry fits lanthanides?","kind":"action"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"What isotopes of lutetium exist, and why are lutetium-176 and lutetium-177 important?","kind":"definition"},{"text":"Which entry fits radioisotopes?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Uses.","layers":[{"id":"medical","name":"Medical","description":"Medical uses.","findings":[{"id":"medical-finding","name":"Medical","description":"Medical.","questions":[{"text":"How is lutetium-177 used in targeted radionuclide therapy, and how are scintillators used in imaging, in general terms?","kind":"provenance"},{"text":"Is the user asking about their own treatment, which needs a clinician?","kind":"boundary"}]}]},{"id":"other","name":"Other","description":"Other uses.","findings":[{"id":"other-finding","name":"Other","description":"Other.","questions":[{"text":"How is lutetium used in catalysts, research and technology?","kind":"provenance"},{"text":"Which entry fits a specific application?","kind":"action"}]}]}]},{"id":"science","name":"Science","description":"Geochronology and supply.","layers":[{"id":"dating","name":"Dating","description":"Lutetium-hafnium dating.","findings":[{"id":"dating-finding","name":"Dating","description":"Dating.","questions":[{"text":"How does lutetium-hafnium dating work, and what does it reveal?","kind":"definition"},{"text":"Which entry fits radiometric dating?","kind":"action"}]}]},{"id":"supply","name":"Supply","description":"Sources and supply.","findings":[{"id":"supply-finding","name":"Supply","description":"Supply.","questions":[{"text":"Where is lutetium obtained, and why is it scarce and expensive?","kind":"provenance"},{"text":"Which entry fits rare earth elements?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How was lutetium discovered, and how was its naming disputed?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can lutetium illustrate rare earth chemistry?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain lutetium's properties, isotopes and uses in catalysis, scintillators and medicine.","Report published information on supply and recycling."],"mustNot":["Describe a radiopharmaceutical treatment as suitable for a specific patient.","Help divert medical radioisotopes from licensed control.","Misrepresent the purity or origin of rare earths for sale."],"requiresHuman":["Any decision on a patient's nuclear medicine treatment."]},"ethics":{"considerations":["Rare earth extraction carries environmental harm for nearby communities.","Radioligand treatments raise hopes; information must be honest about evidence."],"affectedParties":["Patients","Mining communities","Nuclear medicine workers"]},"owners":{"steward":"Nobody owns the element; holders answer for their material and radiation regulators license isotopes.","roles":[],"masterSystems":[]},"relations":[{"target":"Q19569","type":"parent","note":"registry parent class"},{"target":"lanthanide","type":"related","note":"category"},{"target":"chemical element","type":"related","note":"category"},{"target":"iridium","type":"related","note":"another element entry"},{"target":"tantalum","type":"related","note":"another metal entry"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.lutetium","Wikidata: Q1857 (https://www.wikidata.org/wiki/Q1857)"]},"properties":{"applicability":"required","items":["Mass density: About 9.84 g/cm3 - This approximate value applies to solid lutetium near room temperature.","Melting temperature: About 1663 degrees Celsius - This approximate value applies to pure lutetium at atmospheric pressure.","Boiling temperature: About 3402 degrees Celsius - This approximate value applies to pure lutetium at atmospheric pressure."]},"recognition":{"applicability":"required","items":["Atomic number seventy-one","Last lanthanide","Ytterbium precedes it; hafnium follows it","A silvery-white metal."]},"capabilities":{"applicability":"required","items":["explain the element","describe uses","explain dating use","support learning"]},"hazards":{"applicability":"required","items":["Agents giving personal advice on radionuclide therapy","Confusing lutetium with other rare earths","Supply concentration"]},"interfaces":{"applicability":"required","items":["Radiation protection rules for medical isotopes","Rare earth trade and processing regulation","Chemical nomenclature"]},"context":{"applicability":"required","items":["Element seventy-one, the last lanthanide.","lutetium metal and compounds","lutetium isotopes including lutetium-176 and lutetium-177","lutetium-based scintillators","lutetium in radionuclide therapy","lutetium in geochronology"]}},"sources":[{"title":"Wikidata item Q1857: lutetium","url":"https://www.wikidata.org/wiki/Q1857","note":"identity and sense of the item"},{"title":"Wikipedia: Lutetium","url":"https://en.wikipedia.org/wiki/Lutetium","note":"general description of the item"}],"openQuestions":["Should lutetium-177 be a separate entry?","How should medical guidelines be linked?","How should rare earth supply data be linked?"],"resources":{"spec":"/models/things/publications/thing-q1857/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1857/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T03:07:45Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:27+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}