What is a common international unit for measuring radon levels?

The correct option is Bequerels per cubic meter (Bq/m³). This unit is commonly used in the international context to measure radon levels in the environment. The Becquerel represents the activity of a quantity of radioactive material in which one nucleus decays per second. When applied to radon, it provides a direct measure of the radon gas present in a given volume of air, which is essential for assessing exposure levels and establishing safety standards in various countries.

Using Bq/m³ aligns with international standards and practices, especially in scientific studies and regulations aimed at managing radioactive materials. This unit allows for standardized communication of radon levels across different regions and is important for ensuring consistent environmental health assessments.

Other units, while relevant in specific contexts, serve different purposes. PicoCuries per liter (pCi/L), for instance, is more commonly used in the United States, but is not as widely recognized on an international level as Bq/m³. MicroSieverts (µSv) and millirems (mrem) are units of dose measurement that relate to the biological effects of radiation exposure, but they do not directly measure radon concentration itself. Therefore, Bq/m³ stands as the most relevant and internationally recognized unit for