Simple apparatus, using a scintillation counter with a 931-A photomultiplier, is described. The range of alpha-particles from Po210 is determined with this apparatus by varying the pressure in a shielded container, keeping the geometry constant. Data are presented on a 0.06 millicurie source, yielding a range of (3.81±0.03) cm at 760 mm Hg and 15°C. This value is obtained after correction for finite source thickness. The experiment offers particular value in giving students an opportunity to consider statistical fluctuations and to analyze the effects of finite source thickness, straggling, etc.

Topics
Alpha particles, Scintillation counter, Photomultipliers, Education, Corrections, Statistical fluctuations
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© 1953 American Association of Physics Teachers.
1953
American Association of Physics Teachers
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