1. TLD Rings

2. Thermoluminiscent dosimeters
A must for anybody working with radiation sources
Rings contain a radiation sensitive lithium fluoride crystal
Exposure to radiation energizes electrons and traps them in an excited state
Upon heating excited electrons fall back to the ground state and release visible photons
Luminiscence is used to determine radiation dose
TLD rings DO NOT protect you from radiation!!!

3. Safe practices
ALWAYS wear a TLD ring when working with x-ray equipment at the CharFac
NEVER leave a TLD ring inside the safety enclosure
NEVER take a TLD ring outside the x-ray facility
AVOID using multiple rings