Which tool is used for precise measurement of radiation exposure?

The dosimeter is the correct choice for measuring radiation exposure because it is specifically designed to quantify the amount of ionizing radiation a person has received over a given period. Dosimeters can be worn on a person's body as a badge or carried as a portable device, providing a reliable means to monitor radiation levels in various environments, particularly in radiography and nuclear facilities.

This tool functions through various mechanisms, such as film badges, thermoluminescent detectors (TLDs), or electronic dosimeters, all aimed at accurately capturing exposure levels. This precision is crucial for ensuring safety protocols are followed and for minimizing the risk of radiation-related health issues.

Other options listed are specialized tools but serve different purposes: an oscilloscope is used for analyzing electrical signals, an anemometer measures wind speed, and a photometer gauges light intensity. None of these instruments can provide accurate measurements of radiation exposure, highlighting the dosimeter's unique role in radiation safety and monitoring.