Select the best filter for a cobalt x-ray tube that will reduce the intensity of the K? line and transmit the cobalt K? line.
(a) What are the wavelength of the cobalt K? and K? line?
(b) What is your selected filter material?
(c) What is the wavelength of the K absorption edge of your selected filter material?
(a) From the tables the wavelength of the cobalt K? line is 0.1790 nm and the K? line is 0.1621 nm.
(b) If the filter is to transmit the K? line the absorption edge of the filter must have a wavelength that is shorter (higher energy) than the K? wavelength of 0.1790 nm. Iron is a possibility with an absorption edge at 0.1743 nm.
(c) It is also necessary that the filter absorb the cobalt K? wavelength of 0.1621 nm, and iron does this because the K? wavelength is shorter (higher energy) than the wavelength of the iron absorption edge, thus the cobalt K? radiation can excite 1s electrons from the iron atom and be absorbed.
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