A TLD badge based on CaSOp₄: Dy Teflon discs has been designed and is in regular Personnel Monitoring use since 1975. The TLD badge has shown satisfactory performance for monitoring beta and gamma doses of radiation workers. At present about 40,000 radiation workers are covered with TLD monitoring service in our nuclear industry, medical and industrial institutions as well as research institutions. 
The complete Personnel Monitoring TLD badge consists of a TLD card and a plastic cassette for holding the TLD card. The badge is affixed to the clothing of a person with the help of a crocodile clip attached to the badge.

1. Measurement of output from Co-60 units and accelerators used in medicine and industry.
2. Measurement of output from other kilocurie irradiation sources.
3. Area survey of medical (diagnostic and therapeutic) and industrial radiographic installations.
4. Measurement of stray and leakage radiation around X-ray tubes and source containers.
5. Monitoring of high levels of contamination from beta sources.
6. Medical radiographic exposure measurement and population exposure survey studies.
7. Estimation of activities of various radionuclides used in brachytherapy and nuclear medicine.
8. To measure dose rates in rectum and bladder of patient undergoing treatment with Cobalt on Cesium implants for carcinoma of uterine cervix.
9. Personnel Monitoring.