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Density and elemental composition of the three ST phantom materials. The number in the round parentheses is the uncertainty in the last one or two significant figures of the corresponding value.
| Material | Density (g cm−3) | Chemical formula/elemental composition |
|---|---|---|
| POM | 1.40(6) | (CH O2 )n |
| Resin | 1.08(9) | 5%H, 60%C, 35%O |
| Wax | 1.07(8) | C30H62 |
