Aerial gamma-ray contour maps of regional surface concentrations of potassium, uranium, and thorium in Nevada

10.3133/gp982 ◽  
1988 ◽  
Keyword(s):  
Gamma Ray ◽  
Contour Maps

Effects of Precipitation on Surface-Scan Gamma Ray Survey Results: Case Study

2013 ◽  
Author(s):  
N. Dorrell
Keyword(s):  
Gamma Ray ◽  
Gamma Spectroscopy ◽  
Barometric Pressure ◽  
Precipitation Event ◽  
Natural Phenomenon ◽  
Contour Maps ◽  
Weather Events ◽  
Survey Results ◽  
Surface Scan

It has been known for many years that certain weather events (e.g., precipitation, low barometric pressure, etc.) can affect the results of outdoor gamma-ray surveys, particularly those where gamma spectroscopy is being used for the detection of uranium and its progeny. These effects are a result of a natural phenomenon that produces anomalous results that are contrary to the true concentrations present at the survey site. Gamma-ray survey results sometimes overestimate uranium concentrations during and immediately following rain or snowfall events. The effects that a precipitation event has upon a drive-over gamma-ray survey are discussed in this paper. Surveys were conducted using a sensitive array of sodium iodide (NaI) detectors mounted to an all-terrain vehicle in late fall/early winter where snow was encountered. Isotope-specific measurements taken before and during precipitation events are compared and visually presented in iso-contour maps.

Integration of geologic, geochemical, and geophysical data of the Cement oil field, Oklahoma, using spatial array processing

Geophysics ◽  
1983 ◽  
Vol 48 (10) ◽  
pp. 1305-1317 ◽  
Author(s):  
Patricia Termain Eliason ◽  
Terrence J. Donovan ◽  
Pat S. Chavez
Keyword(s):  
Gamma Ray ◽  
Array Processing ◽  
Data Interpretation ◽  
Test Site ◽  
Oil Field ◽  
Pictorial Representation ◽  
Gamma Ray Spectrometry ◽  
Rectangular Array ◽  
Data Set ◽  
Contour Maps

Geologic, geochemical, and geophysical measurements were made at the Cement oil field, Oklahoma, test site using airborne and spaceborne sensors coupled with ground‐based data collection. The data collected include (1) airborne gamma‐ray spectrometry ([Formula: see text], [Formula: see text], [Formula: see text], and total intensity channels), (2) low‐altitude aeromagnetic profiles, (3) precision gravity measurements, (4) images from the Landsat multispectral scanner (MSS) systems and U-2 photography, and (5) geologic and topographic maps. In order to reduce, analyze, display, and correlate the information, it was necessary to transform the data from vector space to raster space (a two‐dimensional image array) with fixed resolution and array dimension. With the data in array form, spatial array processing techniques were applied to (1) correct geometrically the data for proper registration, (2) perform areal interpolation and smoothing, (3) display the data as images, and (4) perform integration and correlation studies. Each data set was transformed into a rectangular array covering approximately 0.3 degrees of latitude and longitude, with each picture element encompassing [Formula: see text]. Because most variables only sparsely populate the raw image array (i.e., flight line data), the data were interpolated and smoothed using spatial filtering techniques to construct continuous images. The individual data sets were displayed as black and white continuous tone images, color coded to form color contour maps, or manipulated to generate shaded‐relief models. Methods for correlation and data interpretation were systematically investigated by using all available sources. Predetermined factual information (“prior knowledge” correlation statistics) was used to establish grounds for correlation and better define the limits of the data. This kind of data manipulation provided an enhanced pictorial representation of the geologic, geochemical, and geophysical anomalies previously documented at Cement.

Specific Activity and Radioactive Contour Map of Anthropogenic Radionuclide (137Cs) in Surface Soil Samples from Chumphon Province, Thailand

2013 ◽  
Vol 770 ◽  
pp. 108-111
Author(s):  
Sutthinee Chauymanee ◽  
Prasong Kessaratikoon ◽  
Ruthairat Boonkrongcheep ◽  
Supphawut Benjakul ◽  
Udorn Youngchauy
Keyword(s):  
Gamma Ray ◽  
Surface Soil ◽  
Specific Activity ◽  
Soil Samples ◽  
The South ◽  
Mean Values ◽  
Anthropogenic Radionuclide ◽  
Spectrometry Analysis ◽  
Contour Maps ◽  
Specific Activities

Specific activities of anthropogenic radionuclide (137Cs) were studied and determined in 132 surface soil samples collected from 8 districts in Chumphon province in the south of Thailand. A high resolution high-purity germanium (HPGe) detector with a massive lead shield and gamma spectrometry analysis system were employed to measure the gamma ray energy spectra from the samples. The specific activity of 137Cs in all of surface soil samples were analyzed by using the IAEA/SL-2 radioactive standard source. It was found that the specific activities of 137Cs ranged from < 0.33 4.43 Bq/kg with mean values of 2.30 ± 1.38 Bq/kg. The experimental results were also compared with research data in the south of Thailand (2009 2012), Office of Atoms for Peace (OAP) annual report data and global radioactivity measurement and evaluations. The data can be also used to create the radioactive contour maps of the investigated area.

On the possible gamma-ray source in Cygnus

1967 ◽  
Vol 31 ◽  
pp. 469-471
Author(s):  
J. G. Duthie ◽  
M. P. Savedoff ◽  
R. Cobb
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Right Ascension

A source of gamma rays has been found at right ascension 20h15m, declination +35°, with an uncertainty of 6° in each coordinate. Its flux is (1·5 ± 0·8) x 10-4photons cm-2sec-1at 100 MeV. Possible identifications are reviewed, but no conclusion is reached. The mechanism producing the radiation is also uncertain.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

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