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A common gamma-ray log records the total radiation and cannot distinguish between the radioactive elements, while a spectral gamma ray log (see below) can. For standard gamma-ray logs, the measured value of gamma-ray radiation is calculated from concentration of uranium in ppm, thorium in ppm, and potassium in weight percent: e.g., GR API = 8 ...
The formation evaluation gamma ray log is a record of the variation with depth of the natural radioactivity of earth materials in a wellbore. Measurement of natural emission of gamma rays in oil and gas wells are useful because shales and sandstones typically have different gamma ray levels.
This bombards the formation with high energy gamma rays. The attenuation of these gamma rays gives an accurate measure of formation density; this has been a standard oilfield tool since 1965. Another source is americium berylium (Am-Be) neutron source used in evaluation of the porosity of the formation, and this has been used since 1950. In a ...
In 2004 H.E.S.S. was the first IACT experiment to spatially resolve a source of cosmic gamma rays. In 2005, it was announced that H.E.S.S. had detected eight new high-energy gamma ray sources, doubling the known number of such sources. As of 2014, more than 90 sources of teraelectronvolt gamma rays were discovered by H.E.S.S. [2]
Wells is on the southern coast of Maine, surrounded by Kennebunk to the northeast, Sanford to the northwest, North Berwick to the west, South Berwick to the southwest, and Ogunquit to the south. According to the United States Census Bureau , the town has a total area of 73.61 square miles (190.65 km 2 ), of which 57.55 square miles (149.05 km 2 ...
A developer is proposing to build more than 100 new homes and about 40 new townhouses on currently wooded property behind the antiques shop at 502 Post Road in Wells, Maine.
In Erie, Pennsylvania, treacherous conditions on Sunday caused some of the city’s plow drivers to get stuck while removing snow, city officials said on Facebook. Erie County is working on ...
The first gamma ray source to be discovered was the radioactive decay process called gamma decay. In this type of decay, an excited nucleus emits a gamma ray almost immediately upon formation. [note 1] Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium.