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. Author manuscript; available in PMC: 2014 Apr 10.
Published in final edited form as: IEEE Trans Med Imaging. 2014 Apr;33(4):875–881. doi: 10.1109/TMI.2013.2297278

TABLE III.

Densities and radiation lengths of materials commonly encountered in proton CT. Data for bone: [15]; data for tissue, water and silicon: [16]

Material Density (g/cm3) Radiation Length, Xo (g/cm2)
bone 1.45 16.6
tissue 1.00 38.2
water 1.00 36.1
silicon 2.33 21.8