Composition data for simple materials:

    Material   Chemical Formula            Mass Fractions                              Specific Gravity
    ---------- --------------------------- ------------------------------------------- ----------------
    Lucite     H$_8$C$_5$0$_2$             H 0.08055, C 0.59985, O 0.31960                   1.19  

    Lexan      H$_{14}$C$_{16}$0$_3$       H 0.05550, C 0.75575, O 0.18875                   1.221  

    water      H$_2$0                      H 0.11190, O 0.88810                              1.000  

    Kapton     H$_{18}$C$_{22}$N$_2$O$_4$  H 0.04813, C 0.70588, N 0.07487, O 0.17112        1.42  

    formaline                              H 0.10071, C 0.15024, O 0.74905                   1.083  




Composition data for human tissues (ICRP 46, 1992) which were used for animal tissue data analysis.
  ICRU 46 (1992): Photon, Electron, Proton, and Neutron Interaction Data for Body Tissues


    Material                          Mass Fractions                                 Specific Gravity
    --------------------------------- ---------------------------------------------- ----------------
    adipose tissue, Adult (\#2)       H 0.114, C 0.598, N 0.007, O 0.278, Na~0.001, 
                                      S 0.001, Cl 0.001                                    0.950  

    muscle (Skeletal), Adult          H 0.102, C 0.143, N 0.034, O 0.710, Na~0.001, 
                                      P 0.002, S 0.003, Cl 0.001, K 0.004                  1.05  

    kidney, Adult                     H 0.103, C 0.132, N 0.03, O 0.724, Na~0.002, 
                                      P 0.002, S 0.002, Cl 0.002, K 0.002, Ca 0.001        1.05  

    liver, Adult (healthy)            H 0.102, C 0.139, N 0.03, O 0.716, Na~0.002, 
                                      P 0.003, S 0.003, Cl 0.002, K 0.003                  1.06  

    heart, Adult (healthy)            H 0.104, C 0.139, N 0.029, O 0.718, Na~0.001, 
                                      P 0.002, S 0.002, Cl 0.002, K 0.003                  1.05  

    blood (whole), Adult              H 0.102, C 0.11, N 0.033, O 0.746, Na~0.001, 
                                      P 0.001, S 0.002, Cl 0.003, K 0.002                  1.06  

    breast, whole (50/50 water/lipid) H 0.115, C 0.387, O 0.498                            0.960