Science, Volume 133, 1961: Estimation of total body fat from potassium-40 content.
On the assumption that the potassium content of the lean body mass is constant, it should be possible to estimate fat content in living man from a measurement of potassium-40 activity in the whole-body scintillation counter. A series of such measurements on children and young adults shows good correlations with skin-fold thickness and weight/height ratio as indices of fatness.
Forbes
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Gallup
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Hursh
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D000273:Adipose Tissue; D000818:Animals; D001823:Body Composition; D049673:History, 20th Century; D006801:Humans; D011197:Potassium Radioisotopes / Q000032:analysis*
D011197:Potassium Radioisotopes