{ "model": { "rank": 3560, "code": "thing-q47270", "model_id": "vr.tr.half-life", "name": "half-life", "purpose": "Let an agent handle half-life by domain, calculation and interpretation, and route medication questions to clinicians and pharmacists.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.TME", "industry": "", "version": "", "url": "/models/thing/q47270/", "tier": 2, "score": 84, "payload": { "layer": "wikidata", "aliases": [ "context-sensitive half-life", "effective half-life" ], "aliasCount": 2, "merged": 2, "knownIn": 84, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q47270", "url": "https://www.wikidata.org/wiki/Q47270", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-11T09:12:59Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 1, "engine": "claude" }, "metaModel": { "id": "THING-Q47270", "registryId": "vr.tr.half-life", "name": "half-life", "version": "0.2.0-wave.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.TME" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q47270/", "model": { "registry_id": "vr.tr.half-life", "name": "half-life", "purpose": "Let an agent handle half-life by domain, calculation and interpretation, and route medication questions to clinicians and pharmacists.", "definition": "The time required for a quantity to fall to half its initial value, used for radioactive decay, drug elimination (plasma and effective half-life), chemical reactions and other exponential processes; context-sensitive half-life applies to anaesthetic drugs.", "what_it_is_for": "Describing exponential decay in physics, medicine and chemistry.", "affordances": [ "compute remaining amount after time", "compare isotopes by half-life", "understand drug half-life in general terms", "model exponential decay" ], "distinguishing_features": [ "Time to halve", "Constant for first-order processes", "Used across sciences", "Does not mean gone after two half-lives" ], "appearance": "Not visible; a time value.", "visual_identification": [ "Values in seconds to billions of years", "Radioactive and pharmacological half-lives", "Effective half-life combines processes" ], "physical_properties": [ { "quantity": "carbon-14 half-life", "typical_range": "about 5730", "unit": "years", "note": "" }, { "quantity": "iodine-131 half-life", "typical_range": "about 8", "unit": "days", "note": "" } ], "families_and_kinds": [ "radioactive half-life", "biological and plasma half-life", "effective half-life", "context-sensitive half-life", "chemical reaction half-life" ], "related_models": [ { "relation": "is a kind of", "target": "duration and scalar quantity", "why": "category" }, { "relation": "describes", "target": "radioactive decay and drug elimination", "why": "processes" }, { "relation": "is used in", "target": "radiometric dating", "why": "application" }, { "relation": "is related to", "target": "exponential decay", "why": "mathematics" } ], "identifiers": [], "standards_and_regulation": [ "Nuclear data evaluations", "Medicines product information (SmPC)" ], "failure_modes_and_hazards": [ "Assuming complete elimination after one or two half-lives", "Dosing decisions without clinicians", "Unit errors" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "concept", "name": "Concept", "description": "Which half-life.", "rationale": "Domains differ.", "layers": [ { "id": "domain", "name": "Domain", "description": "Physics or medicine.", "findings": [ { "id": "domain-finding", "name": "Domain", "description": "Domain.", "questions": [ { "text": "Which kind of half-life is meant?", "kind": "definition" }, { "text": "For which substance or process?", "kind": "definition" } ] } ] }, { "id": "value", "name": "Value", "description": "Time.", "findings": [ { "id": "value-finding", "name": "Value", "description": "Value.", "questions": [ { "text": "What is the half-life, from which data source?", "kind": "measurement" }, { "text": "How precise is it?", "kind": "measurement" } ] } ] } ] }, { "id": "calculation", "name": "Calculation", "description": "Decay.", "rationale": "Maths applies.", "layers": [ { "id": "remaining", "name": "Remaining", "description": "Fraction left.", "findings": [ { "id": "remaining-finding", "name": "Remaining", "description": "Remaining amount.", "questions": [ { "text": "How much remains after a given time?", "kind": "measurement" }, { "text": "Which formula is used?", "kind": "definition" } ] } ] }, { "id": "dating", "name": "Dating", "description": "Radiometric.", "findings": [ { "id": "dating-finding", "name": "Dating", "description": "Radiometric dating.", "questions": [ { "text": "How is half-life used to date samples?", "kind": "definition" }, { "text": "What are the uncertainties?", "kind": "boundary" } ] } ] } ] }, { "id": "medicine", "name": "Medicine", "description": "Drugs.", "rationale": "Medicine questions need professionals.", "layers": [ { "id": "drugs", "name": "Drugs", "description": "Elimination.", "findings": [ { "id": "drugs-finding", "name": "Drugs", "description": "Drug half-life.", "questions": [ { "text": "What does drug half-life mean in general terms?", "kind": "definition" }, { "text": "Who should advise on dosing?", "kind": "boundary" } ] } ] }, { "id": "interactions", "name": "Interactions", "description": "Clinicians.", "findings": [ { "id": "interactions-finding", "name": "Interactions", "description": "Interactions.", "questions": [ { "text": "Could other medicines or conditions change elimination?", "kind": "boundary" }, { "text": "Should a pharmacist be asked?", "kind": "action" } ] } ] } ] }, { "id": "safety", "name": "Safety", "description": "Radiation.", "rationale": "Radioactive materials need care.", "layers": [ { "id": "radiation", "name": "Radiation", "description": "Exposure.", "findings": [ { "id": "radiation-finding", "name": "Radiation", "description": "Radiation safety.", "questions": [ { "text": "How long will a source remain hazardous, in general terms?", "kind": "measurement" }, { "text": "Which regulator oversees it?", "kind": "provenance" } ] } ] }, { "id": "misconceptions", "name": "Misconceptions", "description": "Common errors.", "findings": [ { "id": "misconceptions-finding", "name": "Misconceptions", "description": "Misconceptions.", "questions": [ { "text": "Is it wrongly assumed that a substance is gone after two half-lives?", "kind": "boundary" }, { "text": "How can it be explained?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should domain half-lives be separate entries?", "How should nuclear data be linked?", "How should medicine information be linked?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a half-life, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent handle half-life by domain, calculation and interpretation, and route medication questions to clinicians and pharmacists.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: context-sensitive half-life, effective half-life.", "2 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 84 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a half-life, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "context-sensitive half-life", "effective half-life" ] } ], "standing": "Described in 84 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 2 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one half-life from another, and a half-life from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a half-life sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a half-life from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a half-life passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a half-life between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a half-life, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a half-life is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What half-life is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of half-life are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is half-life operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of half-life and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of half-life?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as half-life?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a half-life came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a half-life and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a half-life is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a half-life, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a half-life, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a half-life is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }