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. 2016 Jan 8;43(1):600–612. doi: 10.1118/1.4939082

TABLE II.

Electron densities and I-values of basis materials.

Basis materials ρe (×1023/cm3) I-value (eV)
Water 3.34 75a  
Polystyrene 3.43 68.7b
CaCl2 solution (23%) 3.97 91.2b
a

From the ICRU report (Ref. 25).

b

From the ICRU report (Ref. 25) and the Bragg additivity rule.