Which of the following is not a function of a dosimeter?

A dosimeter primarily functions as a device for measuring and monitoring radiation exposure. Its key role includes monitoring personal radiation dose, which allows individuals to ensure they are within safe exposure limits in environments where radiation is present. By recording cumulative radiation exposure over time, dosimeters help track an individual's total exposure, which is vital for safety and regulatory compliance.

While measuring exposure to radiation is an essential function, the calibration of radiation sources typically falls under the responsibilities of specialized instrumentation or calibration equipment rather than a dosimeter. This distinction is important because calibrating radiation sources requires precise instruments that ensure their output is accurate for various applications, which is not the purpose of a dosimeter. Thus, the option describing the calibration of radiation sources is accurately identified as not being a function of a dosimeter.