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Types of external beam radiotherapy used to treat cancer in the head and neck
| Type | Source | Used for |
|---|---|---|
| Electron beam | Electrical | Superficial lesions |
| Low voltage | X-ray | Superficial lesions |
| Orthovoltage | X-ray | Skin lesions |
| Supervoltage | 60Cobalt | Deeper lesions |
| Megavoltage | Linear accelerator or betatron | Larger lesions |
