Tools and Techniques: Radiometric Methods

Killeen, P.G.; Mwenifumbo, C J; Ford, K L

doi:10.1016/b978-0-444-53802-4.00209-8

Cited by 19 publications

(17 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kimberlite pipes are accompanied by faults with higher values of the relative intensity of MS (Popov et al 2014). Gamma-spectrometric studies are used widely to search for uranium ore with high efficiency (IAEA, 2003;Babayants et al, 2015;Killeen et al, 2015). Also, radiometric studies have shown that total gamma-ray radiation and concentration of radioactive elements are increased in near surface layer.…”

Section: Introductionmentioning

confidence: 99%

Radiometric and seismic study of Chidvinskaya kimberlite pipe (Arkhangelsk diamondiferous province, North of the East European Craton, Russia)

Georgij

Konstantin

Evgenij

et al. 2017

GeofInt

View full text Add to dashboard Cite

Surface geophysical measurements were carried out on Chidvinskaya diamond pipe of the Arkhangelsk diamondiferous province (North of the East European Craton, Russia). Geophysical measurements included a high-precision gamma-spectrometric survey, radon emanation survey in soil air, and microseismic sounding method. Radiometric measurements were used to found radioactivity anomalies of the surface layer over the Chidvinskaya pipe which could be a result of impact of the kimberlite body on a host medium. Deep structure of the kimberlite pipe and host medium was imaged by means of microseismic sounding method. Results indicate that the pipe appears as a high-velocity body. The host medium is low-velocity that is typical for rocks with excessive fissuring. Increased values of total gamma-ray radiation of near surface layer are observed within the pipe contour and exceeded the background values by 2-4 times. Anomalous radon emanation in the soil air was found at the pipe boundaries. According to the microseismic sounding data near-contact zone is a gas-penetrable structure with excessive fissuring. The results of the used methods are in good agreement with each other. The proposed complex of methods has allowed to identify the pipe distinctive feature.

show abstract

Section: Introductionmentioning

confidence: 99%

Radiometric and seismic study of Chidvinskaya kimberlite pipe (Arkhangelsk diamondiferous province, North of the East European Craton, Russia)

Georgij

Konstantin

Evgenij

et al. 2017

GeofInt

View full text Add to dashboard Cite

show abstract

“…Radiometric surveying is conducted to estimate the near-surface concentrations of the naturally-occurring radioactive elements uranium-238 ( 238 U), thorium-235 ( 232 Th) and potassium-40 ( 40 K). Gamma radiation has a high attenuation rate in rocks and soil, therefore only radiation being produced within the top 50 cm of the Earth's surface is being measured [22]. The concentration estimates for each of the three isotopes are used to produce maps to interpret the lithologies or soil types in the area.…”

Section: Applicationsmentioning

confidence: 99%

“…The interpretations can lead to mineral deposit discoveries, as anomalously high concentrations of 238 U and 232 Th can directly indicate the presence of uranium or thorium deposits. High concentrations of 40 K and low Th/K ratios can indicate the presence of potassic alteration which is associated with hydrothermal deposits, volcanic massive sulphide deposits, and epithermal deposits [7,22]. Low concentrations of 40 K and…”

Section: Applicationsmentioning

confidence: 99%

“…A decay step can also produce more than one daughter product, where the probability of producing each daughter product is defined by the branching ratio, BR. Each decay step also has an associated half-life, where some decay steps may last seconds and others thousands of years [22].…”

Section: Radiation Theorymentioning

confidence: 99%

“…For quality assurance, the dead time of the spectrometer is required to not exceed 8 µs per gamma-ray energy deposit, and the FWHM energy resolution at 662 keV should be below 12%. The energy spectrum is recorded every second using 1024 channels from 0 to 3.072 MeV [22].…”

Section: Manned Aerial Radiometric Surveyingmentioning

confidence: 99%

See 2 more Smart Citations

Demonstration of a new gamma spectrometer designed for radiometric surveying with an unmanned aircraft system

Chen¹

View full text Add to dashboard Cite

The performance of a radiometric unmanned aircraft system (UAS) composed of a directional gamma spectrometer, the Advanced Radiation Detector for Unmanned Aircraft System Operations (ARDUO), and a medium-lift helicopter airframe was demonstrated. The ARDUO's properties of the full-width half maximum energy resolution, linearity, gain stability, intrinsic photopeak efficiency, sheet source sensitivity and directional response were characterized in laboratory experiments. Smallscale trials were conducted over a single point source and two point sources of 137 Cs at a 27 m separation. The single point source strength was measured at iii Statement of Contribution v Table of Contents vii List of Tables x List of Figures xi List of Acronyms xiv List of Symbols xvii List of Acronyms Acronym Meaning 40 Ar Argon-40 ARDUO Advanced Radiation Detector for Unmanned Aircraft System Operations 133 Ba Barium-133 Bi Bismuth-214 Bq, kBq, MBq, GBq Becquerel, disintegrations per second, kilo-becquerel, mega-becquerel, giga-becquerel Ci Curie 60 Co Co-60 cps Counts per second 137 Cs Cesium-137 CsI, CsI(Tl) Cesium iodide, thallium-doped cesium iodide CZT Cadmium zinc telluride EDT Eastern day time EKF Extended Kalman Filter xiv Acronym Meaning 152 Eu Europium-152 eV, keV, MeV Electron volt, kilo-electron volt, mega-electron volt FWHM Full-width half maximum g, kg Gram, kilogram GCS Ground Control Station GHz Gigahertz GNSS Global Navigation Satellite System 140 La Lanthanum-140 m, km, cm Metre, kilometre, centimetre MDT Mountain day time xv Acronym Meaning min Minute 54 Mn Magnesium-54 NaI, NaI(Tl) Sodium iodide, thallium-doped sodium iodide NRCan Natural Resources Canada RSI Radiation Solutions Inc. [5] RTL Return to Launch s, µs Second, microsecond

show abstract

Green's Function‐Based Tsunami Data Assimilation: A Fast Data Assimilation Approach Toward Tsunami Early Warning

Wang

Satake

Maeda

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

We propose a new tsunami data assimilation approach based on Green's functions to reduce the computation time for tsunami early warning. Green's Function‐based Tsunami Data Assimilation (GFTDA) forecasts the waveforms at points of interest (PoIs) by superposition of Green's functions between observation stations and PoIs. Unlike the previous assimilation approach, GFTDA does not require the calculation of the tsunami wavefield for the whole region during the assimilation process, because the Green's functions have been calculated in advance. The forecasted waveforms can be calculated by a simple matrix manipulation. The application to the tsunami waveforms recorded by the bottom pressure gauges of the Cascadia Initiative from the 2012 Haida Gwaii earthquake reveals that GFTDA achieves the same accuracy as the previous assimilation approach while reducing the time required to issue a valid tsunami warning.

show abstract

Tools and Techniques: Radiometric Methods

Cited by 19 publications

References 58 publications

Radiometric and seismic study of Chidvinskaya kimberlite pipe (Arkhangelsk diamondiferous province, North of the East European Craton, Russia)

Radiometric and seismic study of Chidvinskaya kimberlite pipe (Arkhangelsk diamondiferous province, North of the East European Craton, Russia)

Demonstration of a new gamma spectrometer designed for radiometric surveying with an unmanned aircraft system

Green's Function‐Based Tsunami Data Assimilation: A Fast Data Assimilation Approach Toward Tsunami Early Warning

Contact Info

Product

Resources

About