TLD Badges

Welcome to Qal-Tek, your trusted source for radiation safety training and more. In this section, we will explore the fascinating world of Thermoluminescent Dosimeter (TLD) Badges and their crucial role in monitoring radiation exposure in various industries.

What is a TLD Badge?

A TLD badge is a small, wearable device used to measure and record an individual’s exposure to ionizing radiation. It provides accurate and reliable data regarding radiation dose received by workers in industries where radiation hazards exist, such as construction and engineering, industrial and safety, and emergency and security fields.

Environmental Monitoring

Apart from personal exposure monitoring, TLD badges are also used for environmental monitoring of radiation. By strategically placing TLD badges in various locations, organizations can gather data on ambient radiation levels and identify potential hotspots. This information aids in assessing workplace safety, ensuring compliance with regulatory standards, and implementing necessary control measures to protect workers’ health.

TLD vs. Film Badges​

Many people wonder about the difference between TLD badges and film badges, another common type of radiation monitoring device. While both serve the purpose of measuring radiation exposure, there are significant distinctions between them.

A TLD badge utilize thermoluminescent materials, such as lithium fluoride or calcium fluoride, which can store energy when exposed to ionizing radiation. These materials emit light when heated, and the intensity of the emitted light is proportional to the radiation absorbed dose received. In contrast, film badges employ photographic films that darken upon exposure to radiation, and the darkness of the film indicates the radiation dose.


The key advantage of thermoluminescent dosimeters badge over film badges lies in their superior accuracy and sensitivity. TLD badges can measure a wider range of radiation energies, including gamma rays, which are highly penetrating and commonly encountered in various industrial settings. TLD badges also have a longer shelf life and can be reused after analysis, making them more cost-effective and environmentally friendly.

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What Does a TLD Badge Contain?

A TLD badge consists of a holder and a thermoluminescent detector. The detector is usually a small chip made of thermoluminescent material, capable of recording radiation exposure accurately. It is placed within the holder, which can be easily attached to clothing or worn as a badge. The badge also contains identification information, allowing for proper tracking and analysis of individual exposure data.

Thermoluminescent Dosimeter (TLD) Badges are invaluable tools in the field of radiation safety. Their accurate measurement capabilities, wider radiation energy range, and reusability make them the preferred choice for monitoring radiation exposure in industries such as construction and engineering, industrial and safety, and emergency and security. By utilizing TLD badges, organizations can effectively protect workers’ health and maintain a safe working environment.

We hope this informative page has provided you with a comprehensive understanding of TLD badges and their significance in radiation safety. For more information, feel free to explore our website or contact us directly.