Abstract
Radiation-induced tagging techniques have been useful for the non-intrusive measurement of two-phase flow parameters such as mass-weighted velocity and void fraction. Pulsed-Neutron-Activation (PNA) measurements in water systems, which use the 160(n,p)16N reaction to produce a 7.1 s half-life 16N gamma tag, have been reported by Kehler [1,2] and Perez-Griffo, et al.[3,4] Using the LINAC at Rensselaer Polytechnic Institute’s (RPI) Gaerttner Laboratory, it was recently observed that in addition to the 160(n,p)16N reaction, there is a more intense 160(γ,n)150 reaction which produces a 122 s half-life positron emitter (150) with a gamma threshold energy of 15.7 MeV. As shown in Figure 1, the cross section of this reaction shows a broad resonance near the gamma energy 22–24 MeV.[5] The annihilation radiation from 150 positron decay results in a tagging signal over an orderof-magnitude more intense than that obtained from 16N. This paper describes the special features of this more intense 150 tag, and where it can make a contribution in two-phase flow research. Results of recent two-phase flow measurements using PPA are presented. The results of simultaneous film thickness measurements in some annular two-phase flows using a needle probe are also presented.
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© 1984 Springer-Verlag Berlin, Heidelberg
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Lin, T.F., Block, R.C., Jones, O.C., Lahey, R.T., Murase, M. (1984). Two-Phase Flow Measurements Using a Pulsed-Photon-Activation (PPA) Technique. 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_21
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DOI: https://doi.org/10.1007/978-3-642-82112-7_21
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