Abstract
The specific surface of a strontium sulphate precipitate, as determined by the direct radioactive method using Sr90, was found to be 12,800 sq. cm. per gm. The specific surface of the same strontium sulphate precipitate was also determined by the indirect method using ThB. Specific surfaces of 30,800 and 21,300 sq.cm. per gm. were obtained using ThB separated, from thorium nitrate, by the chemical separation and emanation methods, respectively. The factor of approximately 2 between the direct and indirect methods indicates that Paneth's theories, while probably correct in the main, may require some modification.
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