Summary
The LOBI γ-densitometers contain a spectrum-stabilization loop, and operate at count rates of around 1 MHz. The high stabilization factor achieved gives them excellent immunity to scintillator and photomultiplier drifts, due to temperature, magnetic fields and fatigue phenomena. The very high counting rate gives excellent immunity to low frequency interference signals due to mechanical vibration, or electrical or magnetic pick-up.
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References
Bell P. R., Davis R. C. and Bernstein W., 1955, Pulse height variation in scintillation counters, Rev. Sci. Instr. Vol. 26, 726
Birks J. B., 1964, The theory and practice of scintillation counting, Pergamon
Caldwell R. L. and Turner S. E., 1954, Gain variation in photomultiplier tubes, Nucleonics Vol. 12, No. 12, 47
Cantarell I., 1964, Theoretical and experimental study of fatigue in photomultiplier tubes, Nucl. Sci. and Engineering Vol. 18, 31
de Waard H., 1955, Stabilising scintillation spectrometers with counting-rate-difference feedback, Nucleonics, Vol. 13, No. 7
Eby F. S. and Jentschke W. K., 1954, Fluorescent response of NaI(T1) to nuclear radiations, Phys. Rev., Vol. 96, 911
Engstrom R. W., Stroudenheimer R. G. and Glover A. M., 1952, Production testing of multiplier phototubes, NucleonicsVol. 10, No. 4, 58
Fincke J. R., Cheever G. C., Fackrell L. J., Scown V. S., Thornton V. B. and Ward M. B., 1980, The development of reconstructive tomography for the measurement of density distribution in large pipe steady-state multiphase flows, NUREG/CP-0015, Dec. 1980
Fricke von K. und Nitschke J., 1963, Ein transistorisierter Spektrumstabilisator, Nukleonik, Bd. 6, Heft 3
Hamamatsu T. V. Co. Ltd., 1980, Photomultiplier tubes catalogue
John H., Reimann J., Alsmeyer H., Hahn H., Megerle A., 1979, Serielles 5-Strahl- -Densitometer zur Dichtemessung einer Zweiphasenstroemung, Kernforschungszentrum Karlsruhe report KfK 2783, Nov. 1979
Keene J. P., 1977, Fatigue and saturation in photomultipliers, EMI Electron Tubes Division application note
Klein J. W., Nowak G., Romanski H. J., Hufschmidt W., 1979, European Two Phase Flow Group meeting, Ispra, June 1979
Koicki, S., Koicki, A. and Ajdacic, V., The investigation of the 0.15 s phosphorescent component of NaI(T1) and its application in scintillation counting
Lassahn, G. D., 1977, LOFT three-beam densitometer data interpretation, TREE-NUREG 1111, October 1977
Lassahn G. D., Stephens A. G., Taylor D. J. and Wood D. B., 1979, X-ray and gamma ray transmission densitometry, International Colloquium on two phase flow instrumentation, E.G.& G. Idaho Falls, June 1979.
Loffel R., 1980, Durchflussmessungen an Zweiphasenstroemungen mittels Radionuklidtechnik, “Forschungsquerschnitt”, Kernforschungszentrum Karlsruhe, F.R.G., Jan. 1980
Moszynski M., Gresset C., Vacher J. and Odru R., 1981, Properties of CsF, a fast inorganic scintillator in energy and time spectroscopy, Nucl. Instr. and Methods, Vol. 179, 271
Nelder J.A. and Mead, R. 1965, A simplex method for function minimization, Computer J. 7, 308
Powell, M.J.D., 1964, An efficient method for finding the minimum of a function of several variables without calculating derivatives, Computer J, 7, 155.
Salt K., 1978, UKAEA Winfrith, personal communication
Sheppard J. D., 1977, Oak Ridge National Laboratory, personal communication
Stephens A. G., 1978, Application of a scanning densitometer for indicating flow regimes during two-phase flow, NUREG/CR-041 T, TREE 1294
Wilkinson D. H., 1950, A stablilizer for proportional counters, J. Sci. Instr. 27, 36
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© 1984 Springer-Verlag Berlin, Heidelberg
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Fortescue, T., Ohlmer, E., Weste, G. (1984). LOBI-Spectrum-Stabilized Gamma-Densitometers. In: Delhaye, J.M., Cognet, G. (eds) Measuring Techniques in Gas-Liquid Two-Phase Flows. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82112-7_13
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DOI: https://doi.org/10.1007/978-3-642-82112-7_13
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-82114-1
Online ISBN: 978-3-642-82112-7
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