Which device is used to monitor exposure to radioactive materials and records dose via thermoluminescence?

Which device is used to monitor exposure to radioactive materials and records dose via thermoluminescence?

• A. TLD Monitor Badge
• B. Geiger Counter
• C. Ionization Chamber
• D. Scintillation Detector

Answer: (A)

Tracking how much radiation a person has been exposed to over a period relies on a dosimeter that records cumulative dose through a light-emitting response when heated. A thermoluminescent dosimeter (TLD) badge uses thermoluminescent material—often lithium fluoride—that stores energy absorbed from ionizing radiation. When the badge is later heated in a reader, the stored energy is released as light, and the amount of light produced is proportional to the absorbed dose. This lets you obtain a record of the worker’s exposure over time, without needing power or active monitoring during use. After readout, the badge can be reused once it’s annealed and prepared for the next monitoring period. Other devices mentioned serve different purposes. A Geiger counter measures real-time radiation activity and gives immediate counts, not a stored dose record. An ionization chamber measures exposure rate in the environment, typically for area monitoring, not an individual’s accumulated dose. A scintillation detector can be used to detect and measure radiation as well, including spectroscopy, but it is not the standard personal dosimeter used to log a dose history via thermoluminescence.

Tracking how much radiation a person has been exposed to over a period relies on a dosimeter that records cumulative dose through a light-emitting response when heated. A thermoluminescent dosimeter (TLD) badge uses thermoluminescent material—often lithium fluoride—that stores energy absorbed from ionizing radiation. When the badge is later heated in a reader, the stored energy is released as light, and the amount of light produced is proportional to the absorbed dose. This lets you obtain a record of the worker’s exposure over time, without needing power or active monitoring during use. After readout, the badge can be reused once it’s annealed and prepared for the next monitoring period.

Other devices mentioned serve different purposes. A Geiger counter measures real-time radiation activity and gives immediate counts, not a stored dose record. An ionization chamber measures exposure rate in the environment, typically for area monitoring, not an individual’s accumulated dose. A scintillation detector can be used to detect and measure radiation as well, including spectroscopy, but it is not the standard personal dosimeter used to log a dose history via thermoluminescence.