NIST XCOM
Also known as NIST Standard Reference Database 8 (XGAM) · Photon Cross Section Database · XCOM
A web database is provided which can be used to calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, for any element, compound or mixture (Z ≤ 100), at energies from 1 keV to 100 GeV.
Getting access
Open access Open
- How to apply
- Not yet verified — we don’t publish a route we haven’t checked.
Summarised from a registry — the exact application route is not yet verified.
About this database
| Website | https://www.nist.gov/pml/xcom-photon-cross-sections-database |
|---|---|
| Subjects | Natural Sciences · Physics · Condensed Matter Physics · Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas |
| Last updated | 2026-10-03 |