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If I understand it correctly, the two units measure quite different things, and can't be directly compared.

The curie is a unit of radioactivity, while the roentgen is a unit of radiation exposure. The curie is equal to 3.7x1010 disintegrations per second or becquerels. A roentgen is that amount of x-rays or gamma rays which will produce 2.58x10-4 coulombs/kg of dry air. Both the curie and the roentgen are units which are primarily of historical interest, except in the US where they are still commonly used. In the rest of the world, they have largely been replaced by the SI units becquerel and coulomb/kg. Also, it is more common to measure air kerma (in units of joule/kg or gray) than to measure exposure. This latter change is because air kerma, as a measure of energy deposited per unit mass, is more directly related to dose than is exposure, a measure of ionization produced per unit mass or volume.

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