Product Name: Selenium‑74 (Se‑74, ⁷⁴Se)

Common Name: Enriched Selenium Isotope

CAS No.: 13981‑33‑4

Atomic Number (Z): 34

Mass Number (A): 74

Neutron Number (N): 40

Atomic Mass: 73.9224764 Da

Natural Abundance: ~0.86–0.89%

Isotopic Purity (Enriched): 99.90% min / 99.95% typical

Form: Metal powder / granules / pieces

Color: Grayish‑black / metallic gray

Stability: Stable (non‑radioactive)

1. Chemical & Nuclear Properties

• Linear Formula: ⁷⁴Se
• Half‑life: Stable
• Nuclear Spin: 0
• Parity: 1
• Mass Excess: −72.21 MeV
• Binding Energy: ~642.9 MeV
• Elemental Purity (Se metal): 99.99% (4N) / 99.999% (5N) available

2. Physical Properties

• Melting Point: ~221 °C
• Boiling Point: ~685 °C
• Density: ~4.81 g/cm³
• Solubility in Water: Insoluble
• Solubility in Organics: Insoluble in ethanol, ether, hydrocarbons
• Conductivity: Semiconductor; photoconductive

3. Typical Specifications (Enriched ⁷⁴Se Metal)

• Isotopic Composition:
  • ⁷⁴Se: 99.90–99.95%
  • ⁷⁶Se, ⁷⁷Se, ⁷⁸Se, ⁸⁰Se, ⁸²Se: ≤0.10% total
• Elemental Impurities (ppm, max):
  • Ag, Al, As, Au, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, Ge, Hg, In, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Pd, Pt, Rb, S, Sb, Si, Sn, Sr, Te, Ti, Tl, V, W, Zn, Zr: ≤1–5 ppm each (custom spec available)
• Oxygen: ≤500 ppm
• Nitrogen: ≤100 ppm
• Carbon: ≤100 ppm

4. Applications

• Nuclear & Isotope Research: Target material for ⁷⁵Se production (n,γ reaction)
• Medical Imaging: Precursor for Se‑75 radiopharmaceuticals & industrial radiography sources
• Semiconductor & Thin Films: High‑purity Se‑74 for sputtering targets, deposition research
• Mass Spectrometry / ICP‑MS: Isotopic standard & calibration reference
• Environmental & Biological Tracing: Stable isotope labeling, tracer studies

5. Storage & Handling

• Storage: Keep in cool, dry, dark place; seal tightly; avoid moisture/oxygen
• Temperature: 15–30 °C (ambient)
• Shelf Life: ≥2 years under proper storage
• Handling: Use gloves & inert atmosphere if opened; avoid inhalation/dust