Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Physical quantities pertaining to phantom composition.
| Phantom Material | Density (g/cm3) |
Electron Density (× 1023 cm-3) |
Relative Electron Density ρe |
| Lung | 0.21 | 0.69 | 0.207 |
| Bone | 1.60 | 5.03 | 1.506 |
| Plastic Water®-Diagnostic/Therapy Range | 1.04 | 3.35 | 1.003 |
| Soft Tissue Target | 1.06 | 3.43 | 1.028 |
The last column is a comparison of the relative electron densities of the various tissue equivalent materials.
