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Shielding attenuation values at low frequencies have been computed for magnetic and nonmagnetic cylindrical tubes based on formulas developed by King.[2] The attenuation in decibels was computed on a digital computer for a range of ratios of wall thickness to depth of penetration from 0.1 to 10 as a function of a nondimensional parameter as used by Kaden.[4] Two graphs are presented that summarize the computer results.
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Saul Shenfeld (1968) studied this question.
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