{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.strontium","code":"thing-q938","url":"https://ver.cy/models/thing/q938/","name":"strontium","alternateNames":["strontium-73","strontium-74","strontium-75","strontium-76","strontium-77","strontium-78","strontium-79","strontium-80","strontium-81","strontium-82","strontium-83","strontium-85"],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A chemical element with symbol Sr and atomic number 38, a soft silvery alkaline earth metal that reacts with air and water, occurring in the minerals celestine and strontianite; strontium compounds give a red colour to fireworks and flares, were used in cathode ray tube glass, and are used in ceramics and magnets, the radioactive isotope strontium-90 is a fission product of concern in nuclear fallout, and strontium ranelate has been used in osteoporosis treatment; the element has four stable isotopes and many radioactive ones from strontium-73 upward.","purpose":"Let an agent identify strontium and its properties, relay isotopes, occurrence, uses and health aspects from reference sources, and distinguish it from neighbouring alkaline earth metals.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Red flame colour","Strontium-90 fallout concern","Chemically similar to calcium","Celestine and strontianite ores"],"structure":{"bundles":[{"id":"identify","name":"Identify","description":"What strontium is.","layers":[{"id":"properties","name":"Properties","description":"Properties.","findings":[{"id":"properties-finding","name":"Properties","description":"Properties.","questions":[{"text":"What are the physical and chemical properties of strontium?","kind":"definition"},{"text":"Is the question about strontium or a neighbouring element?","kind":"boundary"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"Which isotopes exist, and why does strontium-90 matter?","kind":"definition"},{"text":"Which entry fits the specific isotope?","kind":"action"}]}]}]},{"id":"source","name":"Source","description":"Occurrence and production.","layers":[{"id":"occurrence","name":"Occurrence","description":"Occurrence.","findings":[{"id":"occurrence-finding","name":"Occurrence","description":"Occurrence.","questions":[{"text":"Where does strontium occur, and how is it produced?","kind":"provenance"},{"text":"Which entry fits celestine?","kind":"action"}]}]},{"id":"supply","name":"Supply","description":"Supply.","findings":[{"id":"supply-finding","name":"Supply","description":"Supply.","questions":[{"text":"Who produces strontium, and how has demand changed, with sources?","kind":"measurement"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]},{"id":"use","name":"Use","description":"Uses and health.","layers":[{"id":"uses","name":"Uses","description":"Uses.","findings":[{"id":"uses-finding","name":"Uses","description":"Uses.","questions":[{"text":"How is strontium used in pyrotechnics, ceramics, magnets and other products?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"health","name":"Health","description":"Health and environment.","findings":[{"id":"health-finding","name":"Health","description":"Health.","questions":[{"text":"What are the health effects of stable and radioactive strontium, and what about strontium in medicine, in general terms?","kind":"provenance"},{"text":"Is the user asking about personal exposure or treatment, which needs a professional?","kind":"boundary"}]}]}]},{"id":"context","name":"Context","description":"History and science.","layers":[{"id":"discovery","name":"Discovery","description":"Discovery.","findings":[{"id":"discovery-finding","name":"Discovery","description":"Discovery.","questions":[{"text":"How was strontium discovered near Strontian in Scotland and isolated by Davy?","kind":"provenance"},{"text":"Which entry fits the history of chemistry?","kind":"action"}]}]},{"id":"science","name":"Science","description":"Isotope science.","findings":[{"id":"science-finding","name":"Science","description":"Science.","questions":[{"text":"How are strontium isotope ratios used in geology, archaeology and food provenance?","kind":"provenance"},{"text":"Which entry fits isotope geochemistry?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Report strontium's chemistry, minerals and uses from reliable references.","Distinguish stable strontium from its radioactive isotopes when describing a sample."],"mustNot":["Confuse stable strontium with radioactive strontium in any report or label.","Recommend strontium supplements as a treatment for bone disease.","Handle or move material that may be radioactive without the licensed controls.","Dispose of strontium compounds into drains or soil."],"requiresHuman":["Any handling of radioactive isotopes, which requires a licensed operator.","Any medical use."]},"ethics":{"considerations":["Radioactive strontium from fallout and accidents concentrates in bone and harms people for decades.","Supplements marketed from the element's name have caused real harm."],"affectedParties":["People near contaminated sites","Patients taking supplements","Laboratory workers"]},"owners":{"steward":"Nobody owns the element; the licensed holder answers for any radioactive material.","roles":[],"masterSystems":["Radioactive material licensing registers"]},"relations":[{"target":"Q19563","type":"parent","note":"registry parent class"},{"target":"Q428766","type":"parent","note":"registry parent class"},{"target":"alkaline earth metal","type":"related","note":"in registry terms"},{"target":"light metal","type":"related","note":"in registry terms"},{"target":"calcium","type":"related","note":"element 20 in the same group"},{"target":"strontium-90","type":"related","note":"a fission product"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.strontium","Wikidata: Q938 (https://www.wikidata.org/wiki/Q938)","symbol: Sr","CAS: 7440-24-6"]},"properties":{"applicability":"required","items":["atomic number: 38 Z","standard atomic weight: 87.62 u","melting point: 777 degrees C","strontium-90 half-life: 28.8 years"]},"recognition":{"applicability":"required","items":["Element 38, symbol Sr","Alkaline earth metal of red fireworks","Calcium and barium are the neighbouring alkaline earth metals","A silvery metal that turns yellowish in air."]},"capabilities":{"applicability":"required","items":["relay properties and isotopes","explain occurrence and uses","relay health and environmental aspects","distinguish from calcium and barium"]},"hazards":{"applicability":"required","items":["Strontium-90 uptake in bone","Reactivity of the metal with water","Confusing stable and radioactive strontium"]},"interfaces":{"applicability":"required","items":["Radiation protection limits for strontium-90","Chemical safety data sheets","Pyrotechnics regulations"]},"context":{"applicability":"required","items":["Pyrotechnics, ceramics, magnets and specialised uses.","strontium metal","strontium compounds such as carbonate, nitrate and titanate","stable isotopes 84, 86, 87 and 88","radioactive isotopes including strontium-90 and light isotopes from strontium-73 to strontium-78","strontium in medicine and dating"]}},"sources":[{"title":"Wikidata item Q938: strontium","url":"https://www.wikidata.org/wiki/Q938","note":"identity and sense of the item"},{"title":"Wikipedia: Strontium","url":"https://en.wikipedia.org/wiki/Strontium","note":"general description of the item"}],"openQuestions":["Should strontium-90 be a separate primary entry?","How should reference data be linked?","The registry entry has merged aliases naming short-lived isotopes; should they be split off?"],"resources":{"spec":"/models/things/publications/thing-q938/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q938/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T00:18:36Z","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 2026-10-06T19:52:03+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}