Procedures and errors in quantitative historadiography.

Abstract A thorough discussion of the procedures and errors in quantitative historadiography is presented. Accessory apparatus is described for obtaining accurate values for the X-ray absorption constants used in the calculation of mass. Theoretical considerations are made of the accuracy achieved in measuring X-ray absorption with varying tube potential and mass of the unknown structure. The use of relative transmittance procedures is described for increased accuracy in photometry. Results from an experimental determination of the mass of standards are presented.

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