The luminous dial of an old watch gives off 130 fast electrons each minute. Assume that each electron has an energy of 0.50 MeV and deposits that energy in a volume of skin that is 2.0 cm² in area and 0.20 cm thick. Find the dose (in Gy) that the volume experiences in 1.0 day. Take the density of skin to be 900 kg/m³.
42 μGy
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