Table 3. Theoretical and experimental data of mass attenuation coefficients
 of 60 KeV gamma photons for water, soil and geologic materials
 (Ferraz, 26).

 Number of Absorber Mass Attenuation Coefficient, f
Determinations Material Theoretical Experimental
 (cm2/g) (cm2/g)
 14 water 0.20522 0.2001
 15 sand 0.25030 0.25008
 16 horizon A2, soil 0,26498 0.26361
 17 horizon B1, soil 0,26628 0.27392
 18 horizon C2, soil 0.26607 0.28005
 19 horizon C6, soil 0.28814 0.27718
 20 fresh rock 0.26692 0.26659
 23 calcium carbonate 0.37068 0.35342
 1 red soil 0.42450 0.41771


 0)


E





 .1


Theoretical Attenuation
 PT (cm2/g)


Coefficient


Figure 5. A plot of theoretical and experimental mass attenuation coefficient
values for soils and other absorber materials shown in Table 3.
 20