Abstract
The design of a single-beam gamma densitometer operated in the count mode is briefly described. The design is simple and reasonably compact and is suitable for two-phase flow void fraction measurement in small diameter tubes. The influence of the various parameters and test conditions on the gamma densitometer has also been thoroughly examined. The void fraction results were calibrated against the readings from a set of quick-closing valves. The test results show that the performance of the gamma densitometer is good, and that the measurement algebraic error is within +or-5% (the rms deviation is less than 7%). It also shows that a good average void fraction could be obtained by measuring the volumetric void fraction for the small pipe size. The typical design of such a gamma densitometer is summarized.
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