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Radon is measured in picocuries, which quantifies the amount of radioactive decay occurring in a sample of radon gas. The picocurie is particularly useful when discussing radioactivity because it represents a very small unit of measurement—one trillionth (10^-12) of a curie. This specificity is crucial for accurately assessing radon levels in environments such as homes or buildings, where even small amounts can pose health risks over time due to the inhalation of radioactive particles.

The other options reflect units of measurement used in different contexts. Picosieverts are used for measuring radiation dose but are not specific to radon. Millirems are also a unit of dose equivalent radiation but pertain more broadly to exposure rather than concentration of radon specifically. Micrograys refer to a unit of absorbed dose of radiation and, like millirems, do not directly measure the concentration of radon. Therefore, picocuries is the most pertinent unit for understanding and measuring radon exposure risks.