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  The Footprint Characteristics of Cosmic Ray Thermal Neutrons

Jakobi, J., Huisman, J. A., Köhli, M., Rasche, D., Vereecken, H., Bogena, H. R. (2021): The Footprint Characteristics of Cosmic Ray Thermal Neutrons. - Geophysical Research Letters, 48, 15, e2021GL094281.
https://doi.org/10.1029/2021GL094281

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008241 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008241_1
Genre: Journal Article

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 Creators:
Jakobi, J.1, Author
Huisman, J. A.1, Author
Köhli, M.1, Author
Rasche, Daniel2, Author              
Vereecken, H.1, Author
Bogena, H. R.1, Author
Affiliations:
1External Organizations, ou_persistent22              
24.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146048              

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 Abstract: The advance of the cosmic ray neutron (CRN) sensing method for estimating field scale soil moisture relied largely on simulations of the footprint properties of epithermal neutrons (∼0.5 eV–100 keV). Commercially available CRN probes are usually additionally equipped with a thermal neutron (<0.5 eV) detector. The potential of these measurements is rarely explored because relevant features of thermal neutrons, such as the footprint and the sensitivity to soil moisture are unknown. Here, we used neutron transport modeling and a river crossing experiment to assess the thermal neutron footprint. We found that the horizontal thermal neutron footprint ranges between 43 and 48 m distance from the probe and that the vertical footprint extends to soil depths between 10 and 65 cm depending on soil moisture. Furthermore, we derived weighting functions that quantify the footprint characteristics of thermal neutrons. These results will enable new applications of thermal neutrons.

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 Dates: 2021-08-062021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2021GL094281
GFZPOF: p4 T5 Future Landscapes
OATYPE: Hybrid Open Access
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 48 (15) Sequence Number: e2021GL094281 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)