A comprehensive study of the measurement of the wall thickness of microballoons for laser-induced fusion has been completed. Four different techniques have been investigated: microradiography, scanning electron microscopy, and two interference methods. Measurements of wall thickness on 13 microballoons have been made by all techniques. The results obtained with the four methods were equal within the experimental error of each.
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Halpern et al. (1977) studied this question.
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