Low-energy gamma ray attenuation characteristics of aviation fuels

  • 38 Pages
  • 2.83 MB
  • English
National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, For sale by the National Technical Information Service] , [Washington, D.C.], [Springfield, Va
Airplanes -- Fuel consumption -- Measurement., Gamma rays -- Attenuation., Mass attenuation coefficients., Aircraft fuels., Airports., Energy absorption., Fuel systems., Gamma ray absorption., Gamma
Other titlesLow energy gamma ray attenuation characteristics of aviation fuels.
StatementJag J. Singh, Chih-Ping Shen, Danny R. Sprinkle.
SeriesNASA technical paper -- 2974.
ContributionsShen, Zhiping., Sprinkle, Danny R., United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., Langley Research Center.
The Physical Object
Pagination38 p.
ID Numbers
Open LibraryOL16135239M

Attenuation characteristics of Am ( keV) gamma rays were investigated in aviation fuel samples (Jet A and Jet A-l) from 76 airports around the world as part of a world-wide study to measure the variability of aviation fuel properties as a function of season and geographical origin. The study began in August and ended in August.

Gamma Rays Attenuation. See also: X-ray Attenuation The total cross-section of interaction of a gamma rays with an atom is equal to the sum of all three mentioned partial cross-sections:σ = σ f + σ C + σ p σ f – Photoelectric effect; σ C – Compton scattering; σ p – Pair production; Depending on the gamma ray energy and the absorber material, one of the three partial cross-sections.

Get this from a library. Low-energy gamma ray attenuation characteristics of aviation fuels. [Jag J Singh; Chih-Ping Shen; Danny R Sprinkle; United States.

National Aeronautics and Space Administration. Scientific and Technical Information Division.; Langley Research Center.]. gamma attenuation coefficients allow for thin layers to achieve high attenuation relative to other shielding materials, particularly for low energy gammas and x-rays.

Impurities in lower grades of lead can neutron activate. Toxicity and restrictions on disposal asFile Size: 1MB. tion characteristics Low-energy gamma ray attenuation characteristics of aviation fuels book aviation fuels, based on low energy gamma ray attenuation in the test fuels, has been developed.

It has been tested on three types of aviation fuels. It is noted that the mass attenua-tion coefficients of the three fuels are almost equal, even though their linear attenuation coefficients and densities are slightly different.

1. Introduction. Gamma-ray spectrometry (henceforth spectrometry) is a method widely used for nondestructive inspections of nuclear fuel. While fresh nuclear fuel is only very weakly radioactive, the operation of the fuel in the artificial neutron flux of nuclear reactor causes the additional creation of an abundance of artificial radionuclides, many of which are gamma-ray emitters.

Firstly, at a low gamma ray energy range between and MeV the μ m for all rock samples decreased rapidly with increase the gamma energy.

The rapid decrease in the μ m of the selected rocks is resulting due to the absorption photoelectric which is dominated in the low energy region (σ photoele ∝ Z n. E −n = 4 − 5). Characteristics of Gamma Rays / Radiation. Key features of gamma rays are summarized in following few points. Gamma rays are high-energy photons (about 10 times as much energy as the visible photons), the same photons as the photons forming the visible range of the electromagnetic spectrum – light.; Photons (gamma rays and X-rays) can ionize atoms directly (despite they are electrically.

A gamma ray, or gamma radiation (symbol γ or), is a penetrating electromagnetic radiation arising from the radioactive decay of atomic consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.

Paul Villard, a French chemist and physicist, discovered gamma radiation in while studying radiation emitted by radium. Gamma ABSORPTION OF GAMMA RAYS ‘Gamma rays’ is the name given to high energy electromagnetic radiation originating from nuclear energy level transitions. (Typical ranges of wavelength to nm, frequency 2× to 6× Hz, and energy to MeV) The terms gamma rays, nuclear x-rays, and.

Gamma rays are produced in the disintegration of radioactive atomic nuclei and in the decay of certain subatomic commonly accepted definitions of the gamma-ray and X-ray regions of the electromagnetic spectrum include some wavelength overlap, with gamma-ray radiation having wavelengths that are generally shorter than a few tenths of an angstrom (10 −10 metre) and gamma-ray.

Key features of gamma rays are summarized in following few points. Gamma rays are high-energy photons (about 10 times as much energy as the visible photons),; The same photons as the photons forming the visible range of the electromagnetic spectrum – light.

Photons (gamma rays and X-rays) can ionize atoms directly (despite they are electrically neutral) through the Photoelectric effect. series.

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The gamma ray log is commonly given the symbol GR. Once the gamma rays are emitted from an isotope in the formation, they progressively reduce in energy as the result of collisions with other atoms in the rock compton scattering). Compton(scattering occurs until the gamma ray is of such a low energy that it is completely absorbed by the.

Gamma-rays have the smargies above keV). Gamma radiation is very penetrating, relative to alpha and beta particles, and it can easily do damage to a person’s body, especially if it ionizes atoms in chains of DNA, which can lead to tumors, cancer, and genetic damage.

And to add additional information Gamma Rays are artificial. Background measurements in gamma-ray surveys. [Ottawa, Canada]: Energy, Mines, and Resources Canada [Ottawa, Canada]: Energy, Mines, and Resources Canada MLA Citation. The potential of utilizing the light-weight composite metal foams as shielding material replacing current heavy materials was used for attenuation of low energy gamma ray with additional.

with these may absorb X-ray radiation with characteristic spectral absorption edges. Into the -ray regime, scattering o individual electrons is the prime attenuation e ect for a -ray beam, a process with intrinsically continuous spectral characteristics, and reduced in strength as the -rays.

uranium and low-energy gamma rays: T (x Z4/E3 () where ~ = photoelectric, mass attenuation coefficient. ‘Ilk proportionality is only approximate because the exponent of Z varies in the range to As the gamma-ray energy decreases, the probability of photoelectric ab-sorption.

Kim et al. () achieved enhanced gamma-ray attenuation for energies greater than keV using a nano-W/ LDPE composite. In this evaluation, the shielding ability of nano-W/LDPE composite was.

Historical perspective. The invention of the x-ray by Wilhem Roentgen in was a transformative moment in the history of medicine, for the first time making the inner workings of the body visible without a need to cut into the flesh.

2 Roentgen, a Professor of Physics in Würzburg in Germany, was at the time experimenting with electrical currents through cathode ray tubes (Figure 2). Ionizing radiation (ionising radiation) is radiation, traveling as a particle or electromagnetic wave, that carries sufficient energy to detach electrons from atoms or molecules, thereby ionizing an atom or a molecule.

Ionizing radiation is made up of energetic subatomic particles, ions or atoms moving at high speeds (usually greater than 1% of the speed of light), and electromagnetic waves on.

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Full gamma-ray energy peak in measured gammaray spectrum, resulting from total absorption of gamma-ray energy, would be ideal in evaluating the light yield from the new scintillators. However, full energy sensitivity achieved thus far is not statistically viable for fast and accurate light yield energy calibration from the more» new.

Bulk density of sediments and rocks can also be estimated from the measurement of gamma ray attenuation (GRA) of medium-energy gamma rays ( - keV) [23].

The continuous measurement of whole core section density relies on a Cs source (used transmits gamma rays at keV) and a standard NaI scintillation detector coupled with a photo. Experimental measurement of attenuation Gamma ray attenuation for shielding materials constructed from solid lead and steel sheets, quilted lead wool, tungsten and iron suspended in a silicone polymer, and water were measured.

Lead wool blankets, tungsten suspended in polymer (T-Flex® W, 88% by mass W). DEFENSE TECHNICAL INFORMATION CENTER John J. Kingman Road, Fort Belvoir, VA CAL-DTIC (). attenuation coefficient corresponding to Compton scattering to the atomic number of the absorber.

Tasks 1. Measure attenuation curves of gamma radiation emitted by nuclides Cs (cesium) and 60Co (cobalt), using aluminum, iron and lead as absorbers. Plot the attenuation curves and determine corresponding attenuation coefficients. An X-ray, or X-radiation, is a penetrating form of high-energy electromagnetic X-rays have a wavelength ranging from 10 picometres to 10 nanometres, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×10 15 Hz to 3×10 18 Hz) and energies in the range eV to keV.X-ray wavelengths are shorter than those of UV rays and typically longer than those of.

The radioactive decay of the La via beta-decay or electron capture leads to an emission of gamma-rays at ~ MeV or ~ MeV energies and low energy x-rays.

Absorption of emitted radiation causes an internal activity of LaBr 3:Ce up to ~ counts/s/cm 3. Gamma rays are dangerous because they cause cellular damage that leads to DNA damage, cancer and radiation sickness.

Because gamma rays are such a high-intensity, ionizing form of radiation, they pass through normal protections, such as skin, clothing, foil and goggles.

Only high-mass shielding, such as lead, can stop them. Pair production is a gamma-ray that turns into an electron-positron pair.

Details Low-energy gamma ray attenuation characteristics of aviation fuels FB2

This occurs when the gamma-ray is in the intense electric field near the nuclei of the absorbing material. There is a minimum amount of gamma-ray energy that is required for this process to take place.

This minimum energy is the mass of the electron-positron pair, 2m 0c2. The mass attenuation coe cient does not have a particularly strong dependence on the type of material, but will vary dramatically with energy. For low energy gamma particles (or X-rays) will be much larger than for high energy gammas.

This is because photo-absorption is much more probable at .CiteScore: ℹ CiteScore: CiteScore measures the average citations received per peer-reviewed document published in this title.

CiteScore values are based on citation counts in a range of four years (e.g. ) to peer-reviewed documents (articles, reviews, conference papers, data papers and book chapters) published in the same four calendar years, divided by the number of.

The discovery of gamma rays is generally credited to French physicist Henri Becquerel in A high frequency form of electromagnetic radiation, gamma radiation is known to cause types of cancer and other medical issues in human beings.

Nevertheless, when used in a controlled environment, gamma rays can be applied.