What type of exposure does a TLD (Thermoluminescent Dosimeter) measure?

A Thermoluminescent Dosimeter (TLD) is designed to measure cumulative exposure to ionizing radiation over a specific period of time. The TLD contains materials such as lithium fluoride that absorb and store energy from ionizing radiation. When the TLD is heated, the stored energy is released as light, and the intensity of that light is proportional to the amount of radiation exposure the dosimeter experienced.

This ability to capture and measure the totality of radiation exposure over time makes the TLD invaluable for monitoring the cumulative dose that individuals, particularly in healthcare and industrial settings, might receive. Other types of dosimeters might provide instantaneous readings or focus on specific kinds of radiation, but the TLD specifically tracks cumulative exposure, making it an essential tool for effective radiation safety monitoring.