iridium
Let an agent explain iridium as an element and its properties, describe uses and isotopes, explain its role as evidence of the Cretaceous impact, and support learning.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What iridium is.
Element
The element.
Element
Element.
- What are the properties of iridium, and how does it relate to other platinum group metals? definition
- Which entry fits platinum group metals? action
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes of iridium exist, and why is iridium-192 important? definition
- Which entry fits radioisotopes? action
Use Uses.
Industrial
Industrial uses.
Industrial
Industrial.
- How is iridium used in spark plugs, crucibles, contacts, catalysts and electronics? provenance
- Which entry fits a specific application? action
Medical
Medical and radiographic uses.
Medical
Medical.
- How is iridium-192 used in radiotherapy and radiography, and how is it regulated? provenance
- Is a radiation safety concern present now, requiring authorities? boundary
Science Iridium in geology.
Anomaly
The iridium anomaly.
Anomaly
Anomaly.
- How did the iridium layer at the Cretaceous boundary support the impact hypothesis? provenance
- Which entry fits the Cretaceous extinction? action
Sources
Sources and supply.
Sources
Sources.
- Where is iridium obtained, and how is supply organised? provenance
- Which entry fits mining? action
Learn History and teaching.
History
History.
History
History.
- How was iridium discovered and named? provenance
- Which references are standard? provenance
Teach
Teaching.
Teach
Teaching.
- How can iridium illustrate chemistry and earth science topics? action
- Which misconceptions arise? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- iridium-164, iridium-164m, iridium-165, iridium-165m, iridium-166, iridium-166m, iridium-167, iridium-167m, iridium-168, iridium-168m, iridium-169, iridium-169m
What it is Filled
The chemical element with atomic number seventy-seven, a very hard, brittle, dense platinum group metal that is the most corrosion-resistant metal known, with two stable isotopes and many radioactive isotopes, occurring in platinum ores and in unusually high concentration in the geological layer marking the asteroid impact at the end of the Cretaceous; iridium is used in spark plugs, crucibles, electrical contacts, medical devices and, as iridium-192, in radiotherapy and industrial radiography.
Why it exists Filled
Let an agent explain iridium as an element and its properties, describe uses and isotopes, explain its role as evidence of the Cretaceous impact, and support learning.
Distinguishing features Filled
- Extreme corrosion resistance
- High density
- Platinum group
- Impact layer marker
What robots and AI may and may not do Filled
Must not
- Describe radioactive iridium sources as safe to handle outside licensed control.
- Help divert licensed radioactive sources from their keepers.
- Misrepresent the purity or origin of precious metal for sale.
Only with a human decision
- Responding to a found or lost industrial radiation source.
May
- Explain iridium's properties, isotopes and uses in crucibles, spark plugs and electrodes.
- Report published data on its scarcity and recycling.
Moral aspects Filled
- Lost industrial radiography sources have injured people who found them.
- Platinum group metal mining affects workers and communities.
Who is affected
- Workers handling sources
- Members of the public
- Mining communities
Owners Filled
Steward
Nobody owns the element; holders answer for their material and radiation regulators license sources.
Master systems
- Radioactive source registers of national regulators
Links to other meta-models Filled
parent
- Q105789 - registry parent class
- Q223995 - registry parent class
related
- platinum group - category
- heavy metal - category
- tantalum - another metal entry
- impact crater - impact evidence
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.iridium
- Wikidata: Q877 (https://www.wikidata.org/wiki/Q877)
Direct properties required Filled
- Density: Approximately 22.6 g/cm3 - This approximate value describes solid iridium near room temperature.
- Melting temperature: Approximately 2719 K - This approximate value describes pure iridium at ordinary atmospheric pressure.
- Molar mass: Approximately 192.2 g/mol - This value describes iridium with its natural isotopic composition.
Recognition required Filled
- Atomic number seventy-seven
- Most corrosion-resistant metal
- Platinum and osmium are neighbouring platinum group metals
- A silvery-white, very hard and dense metal.
Capabilities and actions required Filled
- explain the element
- describe uses and isotopes
- explain the impact evidence
- support learning
Hazards and failure modes required Filled
- Radiation hazards from lost iridium-192 sources
- Confusing platinum group metals
- Supply concentration
Standards and interfaces required Filled
- Radiation protection rules for iridium-192 sources
- Materials standards for alloys
- Precious metal trading standards
Context of use required Filled
- Element seventy-seven, a platinum group metal.
- iridium metal and alloys
- iridium isotopes including iridium-192
- iridium compounds
- iridium in catalysis and electronics
- iridium in the Cretaceous boundary layer
Sources Filled
- Wikidata item Q877: iridium - identity and sense of the item
- Wikipedia: Iridium - general description of the item
Open questions
- Should iridium-192 be a separate entry?
- How should radiation safety be linked?
- How should the impact hypothesis be linked?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q877/spec.json