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ARS Home » Southeast Area » Auburn, Alabama » Soil Dynamics Research » Research » Publications at this Location » Publication #326604

Research Project: Enabling Management Response of Southeastern Agricultural Crop and Pasture Systems to Climate Change

Location: Soil Dynamics Research

Title: Monte-Carlo gamma response simulation of fast/thermal neutron interactions with soil elements

Author
item Kavetskiy, Aleksandr
item Yakubova, Galina
item Prior, Stephen - Steve
item Torbert, Henry - Allen

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/27/2016
Publication Date: 6/27/2016
Citation: Kavetskiy, A.G., Yakubova, G.N., Prior, S.A., Torbert III, H.A. 2016. Monte-Carlo gamma response simulation of fast/thermal neutron interactions with soil elements [abstract]. International Conference on Physics: Highlighting Innovations and Challenges in the Field of Physics, June 27-29, New Orleans, LA. CDROM.

Interpretive Summary:

Technical Abstract: Soil elemental analysis using characteristic gamma rays induced by neutrons is an effective method of in situ soil content determination. The nuclei of soil elements irradiated by neutrons issue characteristic gamma rays due to both inelastic neutron scattering (e.g., Si, C) and thermal neutron capture (e.g., N, Cl). To apply this method for quantitative analysis of soil elements, the effect of soil density, soil moisture, element distribution by depth, and other factors influencing the gamma response intensity should be determined. The Monte-Carlo (MC) simulation of gamma response spectra of modeled soil samples irradiated by neutrons is a very effective method for determining the above mentioned dependencies. A simulation model using the Geant4 toolkit was developed to define the effect of different soil parameters on the gamma response intensity. For instance, the direct proportional dependencies between the intensity of the 4.43 MeV gamma peak attributed to carbon nuclei and the average carbon weight percent in the upper 10 cm soil layer for any carbon depth profile was demonstrated. Both the MC simulation model and results of gamma response simulation from neutron irradiated soils with different characteristics (i.e., C content, density, moisture, different elemental depth profiles) will be presented and discussed. Findings from simulation results were used to conduct experimental soil elemental analysis using characteristic gamma rays induced by neutrons.