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The effects of backsc3ttering upon self-absorption correction curves are demonstrated. Data are given for the backscattering powers of several substancos for the beta rndiations from C14, and for se1fabsorption of samples of barium carbonate and wax, containing C14, mounted on alum:i.num.doi:10.2172/971257 fatcat:wkqchrcuqnenlcmrnfjlno5tla