In passing through a material, y radiation ionizes via three main processes. Describe each of these. In each case over what energy range are they the dominant ionization process?

most dangerous?

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Since the atmosphere shields us from the cosmic rays, the higher we go in our atmosphere, the more radiation we are subject to. Therefore the amount of instantaneous radiation is larger when travelling on an airplane, compared to staying on the Earth's ground. For example, a long-distance airplane flying at cruising altitude exposes each passanger to an extra dose of radiation of about 5 μµSv per hour. Now, assume that, for anyone who is not taking any flights, the natural background exposure in a year is 3 mSv, and assume also that there are no other significant sources of radiation. Part A After how many hours of flying would a person double her or his yearly radiation dose? Express your answer in hours. ΨΕΙ ΑΣΦ t = Submit Request Answer ? h

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