In which unit is the radiation weighing factor typically expressed?

The radiation weighing factor, which is used to account for the different biological effects of various types of radiation, is not expressed in any specific unit. Instead, it is a dimensionless number that serves as a multiplier in radiation dose calculations, allowing for the comparison of the effectiveness of different radiation types. This factor helps in converting the absorbed dose, measured in grays (Gy), into a dose equivalent, measured in sieverts (Sv), which takes into account the biological impact of the radiation.

While other choices might provide units relevant to radiation measurements, they do not apply to the radiation weighing factor itself. The absence of a specific unit highlights the factor's role in modifying the dose rather than being an independent measurement. This dimensional aspect reinforces the understanding that the radiation weighing factor is more about relative risk rather than a physical quantity with a conventional unit of measure.