Tm
Thulium
Z = 69 · Lanthanide · 168.9 u
Nuclear Engineering Significance
Lanthanide with moderate thermal absorption (σ_a ≈ 105 b). Not commonly used in reactor systems. Occasionally encountered in rare earth analyses of fission products and in specialized neutron measurement applications.
Basic properties
- Atomic number (Z)
- 69
- Standard atomic mass
- 168.9 u
- Category
- Lanthanide
Isotopes & cross-section data
No nuclide data for this element in the reference database.
The NRDP database focuses on nuclides relevant to reactor physics. For full isotope data, see NNDC NuDat 3.