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The narrow beam attenuation coefficient of air was measured at 5.895 keV. An 55Fe source of Mn x rays with a CrKβ filter and a collimated low-energy sodium iodide counter were used. The photon intensity as a function of the source-detector distance was determined in vacuum and in atmospheric air. The value of the measured coefficient is 24.55±0.25 cm2/g.
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McCrary et al. (1969) studied this question.
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