Abstract
Because other methods had proved inadequate for determining the sizes of pores and cracks in oxide films on zirconium alloys a mercury porosimeter was specially developed for this purpose. By plotting the resistive component of the impedance of the oxide film as a function of pressure (up to 10 5 psi) for a specimen immersed in mercury it was possible to determine the size distribution of flaws in the oxide. Evidence is presented to show that the defects detected in the oxide film are real and were not created by the conditions in the porosimeter. It is concluded that the smallest flaws identifiable in the porosimeter are below the resolution of a conventional two-stage electron microscope replica technique.
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