Question: An X-ray with energy 60 keV strikes a gadolinium-based phosphor on a CR plate producing photons at a wavelength of 415 nm. The energy conversion

An X-ray with energy 60 keV strikes a gadolinium-based phosphor on a CR plate producing photons at a wavelength of 415 nm. The energy conversion coefficient for this process is 20%. How many photons are produced for each incident X-ray? (Planck’s constant = 6.63×1034 Js, 1 eV = 1.602×10-19 J).

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