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Linear attenuation coefficient

Having the densities the same material measured at two

tube voltages, one can solve for Z:



1







1

i

Z

4

F E

1

i

,

Z







G E

1

i

,

Z









i





Z

4

F E Z







G E Z













0

2

2

i

2

i

,

2

i

,





i

Or, solve for both Z and density simultanetously

M. Bazalova et al., PMB 53 (2008); Bazalova et al Radiother Oncol 86 (2008)