Individually barcoded TLD extremity dosimeters worn on the fingers, wrists or head to monitor skin dose and dose to the lens of the eye.
Extremity dosimeters are used where whole-body dosimeters cannot measure dose close enough to the radiation source, for example when handling unsealed radioactive materials in nuclear medicine, radiopharmaceutical production and radiochemistry, in glove box work, fuel handling and decommissioning. They are available in a variety of materials and with multiple filtration alternatives, enabling monitoring for gamma, beta or neutrons as needed.
The dosimeters are processed with Harshaw TLD readers such as the Harshaw 8800 Plus, which is available with a built-in barcode reader for EXT-RAD or DXT-RAD. More readers and TLD materials are covered under Harshaw TLD Readers, Cards and Materials.
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| Useful range | 0.20 mSv to 10 Sv (20 mrem to 1000 rem); XD-100: 0.20 mSv to 1 Sv (20 mrem to 100 rem) |
|---|---|
| EXT-RAD models | XD-107H (TLD-100H), XD-707H (TLD-700H), 7 mg/cm²; XD-100 (TLD-100), 100 mg/cm² |
| DXT-RAD models | DXT-107H (TLD-100H), DXT-707H (TLD-700H), 7 mg/cm²; DXT-100 (TLD-100), DXT-600 (TLD-600), DXT-700 (TLD-700), 100 mg/cm² |
| Application | Photon and beta (LiF:Mg,Cu,P); photon (LiF:Mg,Ti); neutron with DXT-600 used with DXT-700 |
| Fading (DXT-RAD) | Negligible (LiF:Mg,Cu,P); 5 %/yr at 20 °C with anneal (LiF:Mg,Ti) |
| Caps for DXT-RAD | 3.3 mg/cm² (photon, beta, neutron) or 42 mg/cm² (photon, neutron) |
Source: Thermo Fisher Scientific, Harshaw TLD Materials and Dosimeters brochure (2025) and product pages 26985 and 500644. Full specifications are available in the documents.
