Unit of measurement used on scales that measure low levels of radiation?

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Multiple Choice

Unit of measurement used on scales that measure low levels of radiation?

Explanation:
Radiation exposure scales for low levels use a smaller, more convenient unit to show tiny amounts of ionization in air. One milliRoentgen is one-thousandth of a Roentgen, giving fine enough resolution to read very small exposures without switching units. The Gray measures absorbed dose in tissue, not exposure in air; the Becquerel measures radioactive decay rate (activity); and the Roentgen is the older, larger unit for exposure. For low-level readings, milliRoentgen provides the appropriate scale and precision.

Radiation exposure scales for low levels use a smaller, more convenient unit to show tiny amounts of ionization in air. One milliRoentgen is one-thousandth of a Roentgen, giving fine enough resolution to read very small exposures without switching units. The Gray measures absorbed dose in tissue, not exposure in air; the Becquerel measures radioactive decay rate (activity); and the Roentgen is the older, larger unit for exposure. For low-level readings, milliRoentgen provides the appropriate scale and precision.

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