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Applications of nuclear techniques for in vivo body composition studies at Brookhaven National Laboratory

Description: A series of technical developments and their clinical applications in various nuclear technologies at Brookhaven National Laboratory is described. These include the development of a portable neutron activation facility for measuring cadmium in vivo in kidney and liver, a technique for the measurement of body iron utilizing nuclear resonant scattering of gamma rays, a non-invasive measure of the skeletal levels of lead by an x-ray fluorescence technique, and the development of a pulsed Van de Graaff generator as a source of pulsed neutrons for the measurement of lung silicon. (ACR)
Date: January 1, 1981
Creator: Cohn, S.H.; Ellis, K.J.; Vartsky, D.; Vaswani, A.N. & Wielopolski, L.
Partner: UNT Libraries Government Documents Department

In vivo-detection, localization and measurement of radionuclides in man: a detection system for the localization amd measurement of small amounts of photon emitters. Progress report, March 1, 1981-October 31, 1981

Description: The design, construction, and testing of a photon detection system which will yield, simultaneously, information proportional to both the magnitude and location of sources of radioactivity are under investigation. The operating principle of the detector system, active collimation, allows spatial resolution by utilizing the crystal elements themselves as the collimating device; hence a greater counting efficiency is attainable. Two approaches have been tested thus far: in the first, the differences in characteristics of various crystals are utilized as the means of separating events occurring in each of five crystals viewed by a single phototube; in the second, smaller, single crystal/phototube elements are used in the array. Mathematical processing of the counts from the individual crystal elements is then employed in conjunction with their geometric relationship to develop both positional data and to quantify the amount of radioactivity. By utilizing crystal elements in an active collimation configuration and incorporating them in an array which permits these crystals to be alternately advanced and retracted in a programmed, ordered manner, a high degree of spatial resolution is achievable without compromising system sensitivity. The experiments include development of the optimal crystal configuration and the evolving of data processing techniques to translate detector response into precise source position information for localization or imaging purposes. Such a system could add another dimension in studies involving uptake, distribution, and retention of radionuclide labeled compounds because of its ability to actively track, in vivo, the distribution of these compounds. In addition, it should be possible to study, dynamically, the motion of organs, such as the heart or lungs, through which these compounds move. (ERB)
Date: November 1, 1981
Creator: Laurer, G. R.
Partner: UNT Libraries Government Documents Department

Synthesis of hydrocarbons in the earth's crust

Description: This report suggests an alternative theory for the generation and migration of petroleums. Considerable evidence supports the conclusion that life processes persist deep within terrestrial and marine environments. Such in vivo processes may survive in photon-free ecologies using mechanisms that both reduce carbon dioxide and oxidize sulfides. These in vivo conversions create petroleums.
Date: November 1, 1981
Creator: Vanderborgh, N.E.
Partner: UNT Libraries Government Documents Department