What is a personal TLD like?

The whole body type TLD is a dosimeter card contained in a plastic case holder. The dosimeter card contains chips of thermoluminescent LiF or CaF2 crystal. There are different filters above the chips for discriminating the radiation types and measuring the appropriate dose quantities. The dosimeter card is uniquely identified by a bar code and each TLD is distinguished by the user name labeled on the holder.

The finger type TLD is a ringlet dosimeter assembled with a plastic finger ring. The LiF or CaF2 crystal is embedded in a small ring of the TLD. The ring which is uniquely identified by a printed bar code, records the radiation dose received by the worker. Finger type TLD is suitable for personnel whose hands are directly exposed to radiation, e.g. x-ray machine operator and radiation laboratory staff to ensure more accurate dose quantities are recorded.