Abstract
The adequacy of the neutron attenuation method for radial void profile measurement in two-phase flow has been tested. This has been carried out by comparing the cross-sectional average void fraction obtained by the neutron attenuation method with that obtained by the trapping method using quick-closing shut-off valves. It has also found that the time-fluctuation of the transmitted neutron beam through the flow channel presents an excellent method to identify the flow regime and to test for fully developed flow. This is especially important for non-transparent test channels where visual and photographic observation methods are not possible.
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