What does a dosimeter specifically measure?

A dosimeter specifically measures exposure to ionizing radiation, such as X-rays. In various fields, especially in medical and occupational settings, dosimeters are essential for monitoring radiation exposure to ensure it remains within safe limits for health and safety purposes. Individuals, particularly radiology technicians, veterinarians, and others working with X-ray equipment, use dosimeters to track cumulative exposure over time.

The other options do not align with the function of a dosimeter. Humidity measurements pertain to environmental conditions and are usually taken with hygrometers, while temperature readings of chemicals require the use of thermometers. The health of animals is assessed through clinical evaluations and diagnostic tests, which are not the focus of what a dosimeter measures. Therefore, the correct answer highlights the specific role of dosimeters in radiation safety and monitoring X-ray exposure.