Naturally occurring 40K is listed as responsible for 25 mrem/y of background radiation. Calculate the mass of 40K in gra

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Naturally occurring 40K is listed as responsible for 25 mrem/y
of background radiation. Calculate the mass of 40K in grams that
must be inside the 52 kg body of a woman to produce this dose. Each
40K decay emits a 1.32 MeV 𝛽, and 48% of the energy is absorbed
inside the body.
How many photons strike a patient being x-rayed, where an
intensity of 1.30 W/m2 illuminates 0.0750
m2 of her body for 0.290 s? The
energy of the x-ray photons is 100 keV.
photons