Circle of investigation of an air-borne gamma-ray spectrometer

Duval, Joseph S.; Cook, B.A.; Adams, J.A.S.

doi:10.1029/jb076i035p08466

Cited by 47 publications

(23 citation statements)

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“…The acquisition height was 0.80 m with 1 s sampling (~5 m along the sample line). Half of the observed gamma rays originate from the top 0.10 m of dry soil and 90% from the top 0.30 m (Duval et al 1971;Taylor et al 2002). Potassium (cK), uranium (cU) and thorium (cTh) are the three major gamma-emitting elements in soils and rocks.…”

Section: Geophysical Survey Datamentioning

confidence: 95%

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Site assessment of a woody crop where a shallow hardpan soil layer constrained plant growth

et al. 2006

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The establishment of a woody crop component within dryland agricultural systems in Australia is gaining momentum. Perennial woody crops are assumed to prevent recharge to groundwater and thus control landscape-scale salinization. To optimize the design of these new farming systems it is important to (1) understand the factors limiting woody crop growth and (2) be able to predict survival and growth. On a hill slope, in a water-limited site in southwestern Australia, tree-height was measured across several established belts of a woody crop (Eucalyptus polybractea). The major factor limiting growth was soil depth, with tree-height limited by depths at < 4 m. The tallest trees were associated with a soil depth of 4-6 m in the mid slope position of the sandplain landform. To model growth across the field site, tree-height was regressed against geophysical (magnetic, radiometric, electromagnetic) and topographic data using a multivariate regression tree method. Radiometric and topographic data distinguished two tree-height units which were associated with different soil depths. Radiometric data identified the sandplain landform which included the best growth evident at the field site. Within the sandplain landform, shorter trees were associated with lower elevations. This paper demonstrates the utility of radiometric and topographic data as tools for identifying suitable sites for the establishment of woody crops.

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Section: Geophysical Survey Datamentioning

confidence: 95%

“…Radiometric and elevation data is related to properties in the top of the soil profile (Duval et al 1971;Taylor et al 2002). In this study, the data were indicative of soil depth, an important factor in understanding tree growth across the field site ( Fig.…”

Section: Hardpan Depth Limiting Tree Growthmentioning

confidence: 99%

Site assessment of a woody crop where a shallow hardpan soil layer constrained plant growth

et al. 2006

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“…By contrast, the aircraft flew an average distance of 60 m during one measurement period, and the nominal spacing between flight lines was 100 m. Hence it is unrealistic to expect a better spatial resolution than 100 × 60 m. Further, at a height of 50 m about 60% of the signal will come from outside a circle of radius 50 m (again assuming a plane, isotropic ground source; Duval et al, 1971). This means that a significant fraction of the (pre-gridded) signal will be from outside the nominal 100 × 60 m measurement strip.…”

Section: Comparison With Ground-based Measurementsmentioning

confidence: 95%

Use of Airborne γ-Ray Spectrometry for Environmental Assessment of the Rehabilitated Nabarlek Uranium Mine, Australia

Martín

Tims

McGill³

et al. 2006

Environ Monit Assess

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This article describes an airborne gamma survey of a 7 x 5 km region around the rehabilitated Nabarlek uranium mine in northern Australia. An unusually tight line spacing (100 m) and low aircraft height (50 m) were used, enabling the survey to distinguish man-made structures such as ponds and accommodation areas, as well as creek lines. Positive correlations between airborne data and ground-based readings enabled an estimation of the average absorbed dose rate arising from terrestrial gamma radiation over large areas of the site to be derived. For the fenced minesite area this estimate was 0.31 micro Gy hr(- 1). The airborne survey data were found to be invaluable in helping to plan further ground-level investigations and showed promise as an assessment tool for rehabilitated minesites.

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“…This approach was used to bridge the gap between the gamma radiometric technology and 'on-ground' decisions in plant based industries. the observed gamma rays originate from the top 0.10 m of dry soil and 90% from the top 0.30 m (Duval et al 1971). Wet soils attenuate the signal so the technology is suited in dry arid areas or dry seasons.…”

Section: Discussionmentioning

confidence: 99%

A strategy to extract information from airborne gamma ray spectrometry for applications in plant based industries

Pracilio¹,

Smettem²,

Street³

2006

ASEG Extended Abstracts

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Circle of investigation of an air-borne gamma-ray spectrometer

Cited by 47 publications

References 1 publication

Site assessment of a woody crop where a shallow hardpan soil layer constrained plant growth

Site assessment of a woody crop where a shallow hardpan soil layer constrained plant growth

Use of Airborne γ-Ray Spectrometry for Environmental Assessment of the Rehabilitated Nabarlek Uranium Mine, Australia

A strategy to extract information from airborne gamma ray spectrometry for applications in plant based industries

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