Radiation Dosimetry: TLD and OSL Fundamentals

A set of flashcards reviewing the design, function, materials, and comparative advantages of Thermoluminescent Dosimeters (TLD) and Optically Stimulable Luminescent Dosimeters (OSL).

Why does federal law require people working around radiation to wear personal dosimeters?

To measure and track their radiation dose from job related functions.

What does the acronym TLD stand for?

Thermal luminescent dosimeter.

What does the acronym OSL stand for?

Optically stimulable luminescent dosimeter.

How frequently are personal dosimeters typically read to ensure dose stays within annual limits?

On a quarterly basis.

Which three types of doses are typically detailed in dosimeter reports?

Whole body dose, lens dose (eyes), and dose to the skin and extremities.

What specific type of crystal is contained within a TLD badge?

A lithium fluoride crystal.

How is the stored radiation energy in a TLD crystal released during the reading process?

The crystal is exposed to heat, causing it to release light proportional to the dose.

What is the term for the loss of stored radiation dose energy in a TLD due to high heat or light exposure?

Fading.

What is a primary disadvantage of the TLD reading process regarding data retrieval?

The TLD can only be read once; if a mistake occurs during processing, the information is permanently gone.

What type of crystal is used in an OSL badge?

An aluminum oxide crystal.

What is used to stimulate an OSL crystal to release its stored energy as light?

A laser light.

According to the transcript, why might some facilities choose TLDs over OSLs?

OSLs are more expensive than TLDs.

What are three advantages of OSL dosimeters over TLDs?

They are more sensitive to radiation, they will not fade in heat or light, and they can be read multiple times.