$n=\frac{\rho z{N}_a}{A}$

(electrons/m³)

Density(ρ)

(g/cm³)

I

(eV)

Material

3.51542 × 10²⁹

1.060E+00

75.2

0.54999

Blood, Whole (ICUR-44)

5.95991 × 10²⁹

1.920E+00

112.0

0.51478

Bone, Cortical (ICRU-44)

3.46414 × 10²⁹

1.040E+00

73.9

0.55239

Brain, Grey\White Matter (ICUR-44)

3.1838 × 10²⁹

9.500E−01

64.8

0.55579

An adipose tissue (ICRU-44)