To support the use of soil as a suitable radiation protection material, the effects of soil grain size and pressure on γ-ray attenuation have been tested in the energy region from 279 to 1250 keV. The variation in linear—and mass—attenuation coefficients, μ and μm, with soil grain diameter is found appreciable and independent of soil chemical composition. The increase of μ with pressure is only up to 104 kg/cm2 pressure for soil particles of uniform grain size d = 0.12 ± 0.03 mm. However, no significant change is seen in μm with pressure. The half-thickness values for attenuation were calculated from present data have also been discussed for different γ radiations.