A method is described for obtaining precise measurements of local density (or void fraction) in an axially symmetrical cavitating flow regime wherein a heavy fluid as mercury, molten lead, and so on, is used. The method can be adapted to light fluids by substituting a softer radiation source. Significant information regarding the cavitating flow regime in a particular venturi operating with mercury has been obtained. Among other things it has been shown that regions where substantial damage to test specimens has previously been noted [7] have void fractions of the order of only five percent.

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