TABLE 2

Elemental Composition (% by Mass) of Tissues of Skeletal Spongiosa

ElementTissues of trabecular spongiosa
Active marrow (TAM)*Inactive marrow (TIM)†Endosteum (TBE)‡Trabeculae (TBV)§
H10.511.510.53.4
C41.464.425.615.5
N3.40.72.74.2
O43.923.160.243.5
Na—0.10.10.1
Mg———0.2
P0.1—0.210.3
S0.20.10.30.3
Cl0.20.10.2—
K0.2—0.2—
Ca———22.5
Fe0.1———
Mass density (g cm−3)1.030.981.031.92

  • ↵* TAM = “adult red marrow.”

  • ↵† TIM = “adult yellow marrow.”

  • ↵‡ TBE = “adult soft tissue (male).”

  • ↵§ TBV = “adult cortical bone.”

  • Data taken from ICRU Report 46, Appendix A (21).