Gamma-Ray Attenuation to Evaluate Soil Porosity: An Analysis of Methods

Table 3

Soil physical properties used in the calculations of soil porosity (𝜙).

Soil	Characteristics
	𝜌𝑠 (g cm^−3)*	𝜌𝑝 (g cm^−3)*	𝑈𝑠 (g g^−1)*	𝜃𝑠 (cm^3 cm^−3)*
	^137Cs
Sandy	1.51	2.55	0.221	0.333
Clayey	1.36	2.68	0.308	0.420
Soil	Characteristics
	𝜌𝑠 (g cm^−3)*	𝜌𝑝 (g cm^−3)*	𝑈𝑠 (g g^−1)*	𝜃𝑠 (cm^3 cm^−3)*
	^241Am
Sandy	1.49	2.55	0.214	0.318
Clayey	1.33	2.68	0.307	0.409

The variables 𝜌_𝑠, 𝜌_𝑝, 𝑈_𝑠 and 𝜃_𝑠 represent the soil bulk and particle densities and gravimetric and volumetric soil water contents.