Variation of Component of Natural Background Radiation Originating from Earth’s Crust in United States and World
| Annual Effective Dose (μSv) | |||
|---|---|---|---|
| Region | Cosmic radiation | Terrestrial radiation | Cosmic and terrestrial radiation |
| Atlantic coast | 60 | 160 | 230 |
| Rocky Mountains | 500 | 400 | 900 |
| East, West, and Central | 460 | ||
| Average United States | 270 | 280 | 550 |
| Average worldwide | 390 | 480 | 870 |
Data from (5,6).