Different methods of mass attenuation coefficient evaluation: Influences in the measurement of some soil physical properties

作者：Pires L F; Medhat M E

来源：Applied Radiation and Isotopes, 2016, 111: 66-74.

DOI：10.1016/j.apradiso.2016.02.012

• Monte Carlo simulation (FLUKA, GEANT4 and MCNP)
• Computed tomography
• XCOM
• Soil porosity
• Soil water retention curve
• Soil bulk density

The mass attenuation coefficients of Brazilian soils (mu(s)) and water (mu(w)) were measured and calculated at 59.5 keV (Am-241) photon energy. The mu(s) and mu(w) experimental values were compared using XCOM and Monte Carlo computer codes (FLUKA, GEANT4 and MCNP). The influence of different methods of mu, evaluation on the measurement of soil bulk density (rho(s)) and soil water content (theta) distributions and soil water retention (SWRC) was investigated, rho(s) and theta distributions were analyzed by using computed tomography (CT). Distinct rho(s) distributions were obtained even for similar mu(s) values measured among methods. theta distributions were also greatly influenced by the different methods of mu(w) evaluation. Regarding the SWRC, the results exhibited great differences in the region of structural pores, which directly affected the pore size distribution.

• 出版日期2016-5