[1]A microgram bears the same relationship to a 1000-pound steer as a penny does to $4½ billion. [2]The roentgen is a measure of ionizing radiation, as the foot-candle is a measure of light. In simple terms the roentgen is that amount of X or gamma radiation which produces one electrostatic unit (esu) of electricity in one cubic centimeter (cc) of dry air at standard conditions of temperature and pressure. This may sound like a trivial amount of energy, but it amounts to more than two billion ionizations in each cubic centimeter. [3]From “Epistle To Be Left in the Earth.”
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