| | Cancer | Radiation Therapy
Gamma Rays vs. X-Rays: Speed, Wavelength & Energy Explained
Gamma Rays vs. X‑rays: Key Differences
| Property | Gamma Rays | X‑rays |
|---|---|---|
| Speed | c (299,792 km/s) | c (299,792 km/s) |
| Origin | Nuclear decay/particle annihilation | Electron transitions/bremsstrahlung |
| Wavelength | < 0.01 nm (higher frequency) | 0.01–10 nm |
| Energy | >100 keV (typically MeV) | 0.1–100 keV |
| Penetration | Greater | Less |
Both travel at light speed; gamma rays are higher energy, more penetrating, and originate from the nucleus, while X‑rays arise from electron interactions.
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