GAMMA‐RAY SPECTROMETRY IN CENTRAL MOROCCO

A. Demnati; H. Naudy

doi:10.1190/1.1440529

GAMMA‐RAY SPECTROMETRY IN CENTRAL MOROCCO

Geophysics ◽

10.1190/1.1440529 ◽

1975 ◽

Vol 40 (2) ◽

pp. 331-343 ◽

Cited By ~ 1

Author(s):

A. Demnati ◽

H. Naudy

Keyword(s):

Gamma Ray ◽

Total Count ◽

Gamma Ray Spectrometry ◽

Distribution Maps ◽

Geologic Maps ◽

Uranium Distribution ◽

Low Sensitivity

Correlations between radiometric, aeromagnetic, and geologic maps for the central part of Morocco are shown. Some geologic boundaries are closely followed by the total count. The relatively low sensitivity of the system (400 cu in detector, flown at 150 m) is adequate for producing radioactivity and radioelement distribution maps in this area with a high percentage of outcrop. Maps of thorium count, potassium count, and their ratio emphasize various geologic features. Uranium distribution maps are not presented because the area does not contain really characteristic anomalies in this channel.

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Distributions and Risk Assessment of the Natural Radionuclides in the Soil of Shoubra El Kheima, South Nile Delta, Egypt

Atmosphere ◽

10.3390/atmos13010098 ◽

2022 ◽

Vol 13 (1) ◽

pp. 98

Author(s):

Randa Osman ◽

Yehia H. Dawood ◽

Ahmed Melegy ◽

Mohamed S. El-Bady ◽

Ahmed Saleh ◽

...

Keyword(s):

Gamma Ray ◽

Nile Delta ◽

Natural Radionuclides ◽

Agricultural Practices ◽

Clay Content ◽

Gamma Ray Spectrometry ◽

Distribution Maps ◽

Activity Concentrations ◽

Chemical Attributes ◽

Physical And Chemical

Due to heightening concern about radiation hazards protection, activity concentrations of 226Ra, 232Th, 40K in forty soil samples collected from Shoubra El Kheima in the South Nile Delta were measured using gamma-ray spectrometry. The mean activity concentrations of 226Ra and 40K were higher in 20% of the considered samples than the world average values. A comprehensive comparison with up-to-date data was carried out. Spatial distribution maps of the measured radionuclides and radiological parameters were generated. The distributions of natural radionuclides were influenced by the soil organic matter, clay content, and scavenger metals oxides, as well as differences in the physical and chemical attributes and solubility of these radionuclides. The results revealed that industrial activity and agricultural practices in the study area caused an incremental increase in 226Ra and 40K activity concentrations. It can be deduced that although there are intensive industrial activities in this area, the natural radiation that comes from the soil is normal and does not pose a significant radiological hazard to the public. The natural radioactivity of soil in this area needs to be monitored periodically to prevent unnecessary radiation exposure to inhabitants.

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The relationship between uranium distribution and some major crustal features in Canada

Mineralogical Magazine ◽

10.1180/minmag.1981.044.336.08 ◽

1981 ◽

Vol 44 (336) ◽

pp. 425-436 ◽

Cited By ~ 10

Author(s):

A. G. Darnley

Keyword(s):

Gamma Ray ◽

Gravity Anomalies ◽

Structural Features ◽

Gamma Ray Spectrometry ◽

Low Grade ◽

Bouguer Gravity ◽

Uranium Enrichment ◽

Bouguer Gravity Anomalies ◽

Uranium Distribution ◽

North American Craton

AbstractThe availability of reconnaissance scale geochemical maps for large areas of Canada enables spatial associations between major crustal structures and surface uranium content to be identified. Maps of the distribution of uranium for an area greater than 2 million km2 compiled from airborne gamma-ray spectrometry data are supplemented by maps for uranium, based on stream and lake sediment and some bore hole sampling. These are examined in relation to gravity, aeromagnetic and geological maps.The radioelement distribution can be related in detail to exposed bedrock and surface geology, but in addition there is evidence of the control of uranium distribution by major structural features which are marked by granitoids containing elevated levels of radioelements; several of these granitoids are associated with large negative Bouguer gravity anomalies. The distribution of such granitoids appears to be related to ‘megashears’, as in the case of the South Mountain batholith in Nova Scotia, or zones of tension. A belt of uranium enrichment, the Athabasca axis which is characterized by uraniferous granitoids with negative Bouguer gravity anomalies and associated tension faulting extends 2500 km northeast-ward from Edmonton, Alberta to the Melville Peninsula. This structure passes under the Athabasca basin which contains many large uranium deposits. Recent evidence that granitoids enriched in radioelements can provide low-grade heat sources over periods of hundreds of millions of years, capable, in favourable situations of maintaining low-temperature hydrothermal circulation is considered to account for uranium and other mineralization in the basin. It is suggested that the transfer of radioelements into the crust at the end of the Lower Proterozoic, was a factor in the stabilization of North American craton.

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Generation and interpretation of geophysical images with examples from the Rae Province, northwestern Canada shield

Geophysics ◽

10.1190/1.1442927 ◽

1990 ◽

Vol 55 (8) ◽

pp. 977-997 ◽

Cited By ~ 17

Author(s):

H. John Broome

Keyword(s):

Gamma Ray ◽

Shear Zones ◽

Gamma Ray Spectrometry ◽

Data Sets ◽

Aeromagnetic Data ◽

Different Types ◽

Geologic Maps ◽

Vertical Gravity ◽

Shaded Relief ◽

Radiometric Data

Different types of images generated from gravity, magnetic, and gamma ray spectrometry data from the Rae Province of the Canadian shield were compared with each other and geologic maps to evaluate their effectiveness for displaying the geologically relevant content of the data sets. Shading methods were useful for enhancing weak directional anomalies in the aeromagnetic data. Multi‐directional, shaded‐relief images produced by overlaying three colored, shaded‐relief images are useful for analysis of anomalies associated with structure. Vertical gravity derivative images display a continuous gravity feature linking the Wager Bay and Amer Lake shear zones that is obscured on the Bouguer gravity intensity image. Detailed vertical magnetic derivative images of the shear zone clearly displayed anomalies associated with the internal structure. Composite images generated using three different geophysical parameters show correlations between the magnetic, gravity, and radiometric data which can be related to the geology. Subtle variations in uranium, thorium, and potassium concentrations determined by gamma ray spectrometry can be effectively displayed using ternary radioelement images

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Gamma-Ray Spectrometric Analysis of Some Trace Elements in the Human Articular Disc of the Mandible

Nuklearmedizin ◽

10.1055/s-0037-1621214 ◽

1963 ◽

Vol 03 (02) ◽

pp. 175-182 ◽

Cited By ~ 1

Author(s):

Bo Bergman ◽

Rune Söremark

Keyword(s):

Trace Elements ◽

Neutron Activation ◽

Quantitative Data ◽

Thermal Neutron Flux ◽

Gamma Ray ◽

Dry Weight ◽

Gamma Ray Spectrometry ◽

Spectrometric Analysis ◽

Articular Disc ◽

Group Separation

SummaryBy means of neutron activation and gamma-ray spectrometry the concentrations in the human mandibular articular disc of the following elements have been determined: Na, Mn, Cu, Zn, Rb, Sr, Cd, W, and Au. The discs were obtained at necropsy from seven men and nine women, ranging in age from 56 to 71 years.The activation was carried out in a thermal neutron flux of about 1.7 XlO12 neutrons × cm−2 × sec.−1 for about 20 hours. A chemical group separationwas performed before the gamma-ray spectrometry. Quantitative data based on the dry weight of the cartilage samples were obtained by comparing the photo-peak area of the identified elements with those of appropriate standards.

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