# Molecular weights from https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses.
# Density souce: Report No. 46: Photon, electron, proton, and neutron interaction data for body tissues (1992)
# Material composition source: same as density

# Material name:
# ICRU brain adult

# Number of elements:
9

# Density:
1.04

# Atomic number(s) and corresponding mass fraction(s):
1    0.107    # hydrogen
6    0.145    # carbon
7    0.022    # nitrogen
8    0.712    # oxygen
11    0.002    # sodium
15    0.004    # phosphorus
16    0.002    # sulfur
17    0.003    # chlorine
19    0.003    # potassium



