Measurement of surface density of thin foils

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Abstract

A Po210 alpha source is used to measure the surface density of thin foils with a resolution of approximately 1 μg/cm2. A calibration procedure is described to convert air equivalents to units of surface density. The mass stopping power of Al, Ni, Ag and Au relative to air, at an alpha energy of 3.72 and 4.33 MeV is reported.

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On leave from The Physics Department, Osmania University, Hyderabad, India.

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