16. Electrical Methods in Geophysical Prospecting
Electrical Methods in Geophysical Prospecting" by S. Ward. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 221,236,114 papers from all fields of science. Search. Sign In Create Free Account. DOI: 10.1016/S0076-695X(08)60601-8;
Radiometrics
— The radiometric, or gamma-ray spectrometric method is a geophysical process used to estimate concentrations of the radioelements: potassium, uranium and thorium in the near surface. This is done by measuring the gamma-rays which the radioactive isotopes of these elements emit during radioactive decay. Airborne gamma …
Mineral Exploration Methods and Applications
Novel methods of gravity, magnetic, electromagnetic, radiometric, and seismic prospecting and their integration, including mathematical aspects of data processing and interpretation, as well as studies on remote sensing and geographic information system in mineral exploration, are welcome. Airborne, ground, and borehole methods could be presented.
A Back Propagation Neural Network-Based Radiometric Correction Method
Radiometric correction is one of the most important preprocessing parts of unmanned aerial vehicle (UAV) multispectral remote sensing data analysis and application. In this article, a back propagation (BP) neural network-based radiometric correction method (BPNNRCM) considering optimal parameters was proposed. First, we used different UAV …
Dating | The Smithsonian Institution's Human Origins Program
— The methods in this series calculate ages differently from other radiometric methods, because their daughter isotopes are unstable. The most commonly used of this series is the 234U-230Th (uranium-thorium) pathway. Thorium is not soluble in water, so geologic material formed from flowing water (like caves) do not usually contain any …
A relative radiometric correction method for airborne …
— Then, the two-point multi-section method is used for relative radiometric correction of HS images. This paper presents the principle, the experimental results, and the analysis of the proposed method. To validate the effectiveness of this method, it was compared with other methods and evaluated by quantitative quality indices.
Advantages of Gamma-Radiometric and …
— Gamma-ray prospecting—is a radiometric survey, based on measurement of natural radioactive background of rocks and ores, or radioactive contamination. Natural earth material radioactivity is caused …
THE PRINCIPLES & PRACTICE OF GEOPHYSICAL …
test the applicability of various geophysical methods under field conditions in Austra lia which, it was considered, might be regarded as fairly characteristic of considerable …
A General Relative Radiometric Correction Method for
method that finds such a mapping in an optimal manner under various histogram dis-tance measures. The method can find a single monotonic mapping between multiple pairs of histograms, such that the mapping will satisfy all pairs simultaneously. The moment matching method assumes that the radiometric distribution of each sensor for ground ob-
Dating Rocks and Fossils Using Geologic Methods
This method is known as radiometric dating. Some commonly used dating methods are summarized in Table 1. The rate of decay for many radioactive isotopes has been measured and does not change over ...
What is radiometric dating?
— Radiometric dating is a method of establishing how old something is – perhaps a wooden artefact, a rock, or a fossil – based on the presence of a radioactive isotope within it.
A simple and effective radiometric correction method to …
— Most relative methods assume that radiometric relationships between the target image and the base image are linear (Du et al., 2002, Elvidge et al., 1995, Schott et al., 1988, Song et al., 2001). A base image, selected to represent some common scale, is not required to be the most accurate reflectance estimation (Song et al., 2001). The ...
The Ultimate Sales Prospecting Guide: Tactics, Tips, and
— The modern sales landscape offers a wealth of methods, from classic cold calling to social selling, each with its own set of tactics and best practices. Outbound prospecting techniques like cold emailing and networking events still hold a powerful sway, while inbound methods rely on creating compelling content that draws in prospects …
Radiometrics
The use of radiometrics predates the use of other geochemical methods. The technique dates back to at least 1926, when the Soviets observed anomalously low gamma counts …
New method of aerial and surface radiometric
Mean Natural Radioelement Content of Sedimentary Rocks [34,614 bytes] A new petroleum exploration method has been developed using surface and aerial gamma-ray spectral measurements...
9 Sales Prospecting Tips & Best Practices In 2024
— Sales prospecting is integral to your sales process. If done correctly, it fills your pipeline with qualified leads. If done incorrectly, you risk wasting time and money chasing down prospects who ...
Radiocarbon dating | Nature Reviews Methods Primers
— Radiocarbon dating uses the decay of a radioactive isotope of carbon (14C) to measure time and date objects containing carbon-bearing material. With a half-life of 5,700 ± 30 years, detection of ...
Gold and Silver Prospection Using Magnetic, Radiometry …
Magnetics (M), Magnetic Total Field Gradient (Mg), Radiometry (Ra), Microgravity (MG) and Microgravity Gradient (MGG) methods were used to prospect the terrains and …
A Fast Method for Modelling A Gamma-Ray Field over
— where dI is gamma-ray intensity by some volume element dV. k is a constant giving the gamma-ray intensity from a given radionuclide of unit weight in unit distance from the detector.v is volume concentration of the radionuclide (g cm −3). r 1, r 2 are distance through the earth (r 1) and through the air (r 2) that the gamma-ray must travel. μ 1, μ 2 …
Utilizing the radiometric and seismic methods for …
An onshore radiometric survey sampled in situ the isotopes U 238, Th 232, K 40, and Rn 222 to build maps of normalized values for each element containing negative and positive radiometric anomalies, which could associate with hydrocarbon deposits in the subsoil. The vertical migration of hydrocarbon, water or other gases would have generated the …
(PDF) MACA: A Relative Radiometric Correction Method for …
— MACA: A relative radiometric correction method for . multi-flight unmanned aerial vehicle images based on . concurrent satellite imagery. Jiale Jiang, Qiaofeng Zhang, Wenhui Wang, ...
Radiometric methods
Common modes of radioactive decay 4 GEOL384/334 –Radiometric methods The common types of radioactive decay reactions are: a-decay - emission of nuclei of Helium, also called a-particles, plus photons (light, X-rays, called "g-particles" here): b-decay –transformation of one neutron into a proton with emission of an electron (b-particle) and
22.3 Half Life and Radiometric Dating
Radioactive dating or radiometric dating is a clever use of naturally occurring radioactivity. Its most familiar application is carbon-14 dating.Carbon-14 is an isotope of carbon that is produced when solar neutrinos strike 14 N 14 N particles within the atmosphere. Radioactive carbon has the same chemistry as stable carbon, and so it mixes into the …
Archaeogeophysics–archaeological prospection – A mini review
— "Archaeomagnetism" (Tite and Mullins, 1971, Tarling et al., 1986) is a developing science that seeks to obtain site-occupation dates (dating method) from the orientation of the remnant magnetic field found in stones lining at ancient kilns."Archaeomagnetism" is a non-prospecting method. Recent summaries of this …
Tools and Techniques: Radiometric Methods
— The chapter reviews the fundamental principles and theory of radiometric techniques, in particular the measurement of natural radiation from the radioelements …
BGR
Airborne radiometric methods are used to determine the natural radioactivity (gamma radiation) of near-surface rocks and soils using a gamma ray spectrometer installed in an aircraft. The measurements reveal information on rock and soil properties, particularly their contents of natural radionuclides. Natural radionuclides are mainly the three ...
Dating, Radiometric Methods
Short-lived systems. An important class of radiometric dating methods uses the decay of short-lived radioactive isotopes. In this case, t ½ is much lower than the age of the Earth, and the parent isotope is continually being produced in nature, usually by the action of energetic cosmic rays on the atmosphere or the Earth's surface. Typically, the daughter …
Radiometric Survey
The radiometric survey detects and maps natural radioactive emanations (γ-rays) from rocks and soils. Gamma radiation occurs from the natural decay of elements like U, Th, …
Gold and Silver Prospection Using Magnetic, …
Combined methods from the fields of geology, geo- chemistry and geophysics were applied to elucidate the regional geologic framework and identify favorable environs for mineralization.
Radiometric Dating Definition, Methods & Examples
— Radiometric dating is a method of measuring the age of geologic materials like rocks and minerals. Radiocarbon dating, a type of radiometric dating can be used to measure the age of materials that ...
Utilizing the radiometric and seismic methods for …
— Method. The methodology radiometric covers the surface of the radioactive elements, which is correlated with the subsurface by means of seismic data (Fig. 2). A gamma-ray spectrometer GR-135 measured the equivalent uranium, equivalent thorium, and potassium in the soil, allowing the measurements and analysis of gamma rays and …
Radiometric Reporting Methods and Calibration in …
INTERNATIONAL ATOMIC ENERGY AGENCY, Radiometric Reporting Methods and Calibration in Uranium Exploration, Technical Reports Series No. 174, IAEA, Vienna (1976) Download to: EndNote BibTeX *use BibTeX for Zotero
A General Relative Radiometric Correction Method for …
— Due to the limitation of the number of sensor pixels, optical splicing is commonly used to improve the imaging width of remote sensing satellites, and this optical stitching can cause vignetting in the image data of adjacent sensors. The weak energy, low signal-to-noise ratio, and poor response stability of vignetting are key factors that restrict …
SAR absolute radiometric calibration method based on …
— Radiometric calibration of synthetic aperture radar (SAR) establishes a crucial connection between image digital numbers and target backscattering coefficients. Natural stable point targets have gained prominence in SAR radiometric calibration since they don't require any additional construction or maintenance expenses compared to artificial …
A General Relative Radiometric Correction Method for …
The relative radiometric correction for Level-0 images captured by spaceborne push-broom imaging system faces the problems of vignetting, chromatic aberration, brightness saturation difference, misalignment, and so on. This article proposed a general relative radiometric correction method, which was applied to Gaofen series satellite Level-0 …
