Ac
metal· JVASP-25096· Ac
Actinium (Ac) is a silvery radioactive metal belonging to the actinide series of the periodic table. It is primarily encountered in nuclear research, medical isotope production, and specialized scientific applications rather than mainstream engineering. Engineers considering actinium should recognize it as a material constrained by extreme rarity, radioactivity, and regulatory oversight—its use is limited to institutional laboratories and nuclear facilities where its nuclear properties (not mechanical properties) drive selection.
nuclear researchmedical isotope productionradiotherapy developmentscientific instrumentationnuclear fuel applicationsexperimental physics
Compliance & Regulations
?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K) | 3,760.8 | ksi | — | ||
Poisson's Ratio(ν) | 0.2500 | - | — | ||
Shear Modulus(G) | 2,343.8 | ksi | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.3035 | lb/in³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 0.000 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | 5.920 | µV/K | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | 0.000 | eV/atom | — |
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
Export Control
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.