(a) If a chest X-ray delivers 0.25 mSv to 5kg of tissue, how many total joules of energy does this tissue receive? (b) Natural radiation and cosmic rays deliver about 0.1 mSv per year at sea level. Assuming an RBE of 1, how many rem and rads is this dose? (c) How many joules of energy does a 75kg person receive in a year? (d) How many chest X-rays like the one in part (a) would it take to deliver the same total amount of energy to a 75kg person as she receives from natural radiation in a year at sea lever, as described in part (c)?

(a) If a chest X-ray delivers 0.25 mSv to 5kg of tissue, how many total joules of energy does this tissue receive? (b) Natural radiation and cosmic rays deliver about 0.1 mSv per year at sea level. Assuming an RBE of 1, how many rem and rads is this dose? (c) How many joules of energy does a 75kg person receive in a year? (d) How many chest X-rays like the one in part (a) would it take to deliver the same total amount of energy to a 75kg person as she receives from natural radiation in a year at sea lever, as described in part (c)?