Could I use a not heavy shielding and good collimation in order to measure void fraction in gas-liquid flow ?
Assuming that the liquid is water, not mercury, radiation should be significantly but not totally attenuated by ~5 cm of water, which leads us to photons of rather low energy (50-100 keV). Shielding is certainly necessary, but will it be light enough for you? In this energy range, a X-ray generator could be considered, with the advantage that the voltage could be optimized for the considered application, and that a license is often easier to obtain for an X-ray generator than for a strong radioactive source.
Dear Dr. Tondeur,
Thank you very much for your elucidating answer ! I really am using water. I will consider using X-ray generator. I work in Nuclear Engineering Institute, so I have access to some radioactive sources. I'll will consider using energy range you suggested me.
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