Question - Secondary Photons in Mammography

Hi Everyone,

Just a quick question in terms of mammography.

If using a Mo/Mo anode/filter combination, I can't get my head around the idea that when you hit the K-edge (and above) on the filter, the photoelectric events will produce a bunch of similar energy photons as the original beam itself. Can somebody explain this? I understand why this isn't an issue in tissue's as the secondary photons from the photoelectric effect of say, calcium, are not penetrable enough to reach the detector.

Thank you

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