Table 1 Physical properties of plaster and PLA.

From: Fabrication of 3D printed head phantom using plaster mixed with polylactic acid powder for patient-specific QA in intensity-modulated radiotherapy

Material

Density (g/cm3)

Molecular weight (g/mol)

Chemical formula

Relative electron density ρe/ρe,water

Chemical composition (percentage by mass)

H

C

O

Ca

Etc

Plaster

2.32a

145.15a

CaH2O5S

1.66d

2.3b

–

55.8b

23.3b

–

PLA

1.24a

72

(C3H4O2)n

1.13d

5.3c

51.9c

42.6c

–

0.2c

  1. aProvided by each fabricator.
  2. bRef14.
  3. cRef15.
  4. dMeasured by CT.
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