Table 2.

Elemental composition, mass fraction, density and Z_eff. of water and water-substitute solid phantom materials. Densities are adapted from Hubbell and Seltzer (1995)

Element		Z	A	Water	Solid Water	RW1	PMMA	Polystyrene
Composition and mass fraction in %	H	1	1.008	0.112	0.081	0.132	0.081	0.077
	C	6	12.011		0.672	0.794	0.600	0.923
	N	7	14.007		0.024
	O	8	15.999	0.888	0.199	0.038	0.320
	Mg	12	24.305			0.009
	Cl	17	35.457		0.001	0.027
	Ca	20	40.078		0.023
Mass density (g/cm3)				0.998	1.015	0.970	1.190	1.060
Zeff. (Calculated)				7.416	7.294	7.210	6.096	5.584