americium
Let an agent explain americium and its properties, relay discovery, isotopes and uses from chemistry references at public reference level, describe smoke detector use and safety, and distinguish americium from neighbouring actinides and from sensitive nuclear topics the model does not cover.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain americium and its properties, relay discovery, isotopes and uses from chemistry references at public reference level, describe smoke detector use and safety, and distinguish americium from neighbouring actinides and from sensitive nuclear topics the model does not cover.
A synthetic radioactive element with atomic number 95, an actinide first produced in 1944 by Seaborg and colleagues, whose isotope americium-241 is used in ionisation smoke detectors and as a neutron and gamma source, with other isotopes from americium-231 to americium-249 including the metastable americium-242m1 studied in nuclear physics; americium is produced in nuclear reactors from plutonium and is handled under radiation safety rules, and the model gives no sensitive nuclear detail.
What it is for: Not applicable; a chemical element.
It can be explain properties; relay discovery and isotopes; describe uses and safety; distinguish related elements.
Distinguishing features
Synthetic actinide
Smoke detector use
Alpha emitter
Reactor by-product
What it looks like
A silvery metal, rarely seen; smoke detector sources are tiny sealed discs.
Physical character
atomic number: 95 count
discovered: 1944 year - Seaborg, James, Morgan, Ghiorso
americium-241 half-life: 432.2 years
smoke detector source: about 0.3 micrograms - typical
How it is recognised
Element 95, actinide
Americium-241 in smoke detectors; isotopes 231 to 249, americium-242m1
Plutonium is element 94; curium is element 96
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is used in - as an ionisation source
is produced from - in reactors
In practice
Families and kinds
americium-241 in smoke detectors and sources
americium-243 in research
metastable americium-242m1
short-lived isotopes from americium-231 upward
americium in nuclear waste
Identifiers
CAS 7440-35-9 americium
symbol Am element symbol
Standards and regulation
IAEA and national radiation safety regulations
Consumer product rules for smoke detector sources
Nuclear material accounting
Failure modes and hazards
Agents providing sensitive nuclear detail
Improper disposal of smoke detector sources
Registry aliases naming many isotopes
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.americium
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What americium is.
Science.
Definition
Definition and properties.
Definition
Definition.
- What is americium, and how does it differ from plutonium and curium? definition
- Is the question about the element, an isotope, smoke detectors, or sensitive nuclear matters the model does not cover? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What are americium-241, americium-243, the metastable americium-242m1 and the short-lived isotopes, at public reference level? definition
- Which entry fits the specific isotope? action
Use Uses and safety.
Regulation.
Detectors
Smoke detectors.
Detectors
Detectors.
- How do ionisation smoke detectors use americium-241, and how are they disposed of safely? provenance
- Which references are standard? provenance
Safety
Radiation safety.
Safety
Safety.
- What radiation safety rules apply to americium sources? provenance
- Is the presentation at public reference level and non-sensitive? boundary
Science Chemistry and physics.
Science.
Chemistry
Chemistry.
Chemistry
Chemistry.
- What are the chemical properties and compounds of americium? provenance
- Which sources are cited? provenance
Waste
Nuclear waste.
Waste
Waste.
- Why does americium matter in spent fuel and waste management, in general terms? provenance
- Which entry fits radioactive waste? action
Context History and research.
Context.
History
History.
History
History.
- How was americium discovered and named? provenance
- Which entry fits Glenn T. Seaborg? action
Research
Research.
Research
Research.
- What research uses americium, including as a power source for space missions, as reported? provenance
- Which entry fits radioisotope thermoelectric generator? action
What the second pass must settle
- Should americium-241 be a separate primary entry?
- How should chemistry references be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?