1. graphically verify Moseley\'s law for the K beta1 lines of Cu, Mo, and W. 2.

Question

1. graphically verify Moseley's law for the K beta1 lines of Cu, Mo, and W.

2. (a)Calculate the mass an linear absorption coefficients of air for Cr K alpha radiation. Assume that air contains 80 % nitrogen and 20 % oxygen by weight and has a density of 1.29*10^-3 g.cm^3.

(b) Plot the transmission factor of air for Cr K alpha radiation and a path length of 0 to 20 cm.

3. suppose that a nickel filter is required to produce an intensity ratio of Cu K alpha to Cu K beta of 100/1 in the filtered beam. Claculate the thickness of the filer and the transmission factor for the Cu K alpha line.

Explanation / Answer

2 (a) Mass absorption coeffs. for mixtures are calculated as

where the index i runs over the components, w_i are the weighing factors for the components and mu and rho are the abs. coeff and density for the element i.
The linear abs. coeff. is straight forward to get from that.

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