Advanced Physics for Brachytherapy 2018

Linear attenuation coefficient

Having the densities the same material measured at two tube voltages, one can solve for Z:

(

) + G E 1 i (

)

Z 4 F E

i å

éë

ùû

, Z

, Z

w 1 i

1 i

m 1 m 2

-

= 0

(

) + G E (

)

Z 4 F E

i å

éë

ùû

, Z

, Z

w 2 i

2 i

2 i

Or, solve for both Z and density simultanetously

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