An average person is exposed to about 360 millirem of background radiation per year from a variety of natural and man-made sources. About two-thirds of that typically comes from inhalation of ²²²Rn produced in soil by the decay of ²³⁸U. Given that ²²²Rn decays by alpha emission, estimate the absorbed dose in 

(a) Joules and 

(b) Grays for a 60-kg person from one year’s inhalation of radon.