NaI
ceramic· NaI
Sodium iodide (NaI) is an ionic ceramic compound formed from sodium and iodine, belonging to the halide salt family with a rock-salt crystal structure. It is primarily used as a scintillation detector material in radiation detection systems, where its high stopping power for gamma rays and excellent light output make it the standard choice for medical imaging (PET/SPECT scanners), nuclear spectroscopy, and radiation monitoring equipment. NaI is valued for its superior energy resolution and detection efficiency compared to alternatives like plastic scintillators, though it requires careful handling due to hygroscopic properties and is often used in thallium-doped form (NaI:Tl) to enhance luminescence efficiency.
gamma ray detectionmedical imaging systemsnuclear spectroscopyradiation monitoringscintillation detectorssecurity screening
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 15.76 | GPa | — | ||
| ↳ | 15.76 | GPa | — | ||
| ↳ | 17.93 | GPa | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.2333 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | Pa | — | ||
Poisson's Ratio(ν)2 entries | 0.2722 | - | — | ||
| ↳ | 0.2600 | - | — | ||
Shear Modulus(G)3 entries | 8.465 | GPa | — | ||
| ↳ | 8.465 | GPa | — | ||
| ↳ | 10.88 | GPa | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 3.746 | kg/m³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 5.800 | eV | — | ||
| ↳ | 3.851 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)3 entries | 8.360 | - | — | ||
| ↳ | 7.087 | - | — | ||
| ↳ | 5.424 range 3.488–7.359median of 2 measurements | - | — | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | — | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij) | 0.000 | C/m² | — | ||
Seebeck Coefficient(S) | -77.72 | µV/K | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.00900 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.492 | eV/atom | — | ||
| ↳ | -1.358 | eV/atom | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
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.