Harshaw TLD Materials Specifications (Thermo)

Tuesday, August 17, 2010

Thermoluminescence dosemeters (TLD) are widely used to monitor personal doses due to photon fields in the radiation protection of workers.
The Thermo Scientific:

 The Thermo Scientific is Themoluminesent Dosimeter cards and Themoluminesent Dosimeter cards and TLD chip reader manufecturing company. Themoluminesent Dosimeter Cards (TLD cards) manufectured by Themo Scientific have following specifications:

Handling and thermal treatment of Harshaw TLD Materials Specifications (Thermo):
Consistent, well-controlled and repeatable procedures are the key to successful TLD. Variations in annealing temperature will affect dosimeter sensitivity, for example. The following guidelines are advisable to optimize the reproducibility of bare dosimeters.
Handling of Harshaw TLD Materials Specifications (Thermo):
Vacuum tweezers should always be used. (Avoid mechanical tweezers or fingers). Small scratches, loss of mass or foreign deposits affect light emission).
Cleaning Harshaw TLD Materials Specifications (Thermo):
Rinse the dosimeters in analytical grade anhydrous methyl alcohol between normal uses. (Do not soak). Dry by leaving to evaporate for at least one hour. Anneal once before actual use, accurately following the established procedure. The anneal will also assist in removing any residual methylalcohol.
Sensitivity to Ultraviolet Light of Harshaw TLD Materials Specifications (Thermo):
Calcium Fluoride Dysprosium (TLD-200), Aluminum Oxide (TLD-500) and Calcium Sulfate Dysprosium (TLD-900) are extremely sensitive to UV light. These materials should be handled and used in the absence of UV light and stored in opaque containers. Calcium Fluoride Manganese (TLD-400) is moderately UV light sensitive.
Limiting temperatures of Harshaw TLD Materials Specifications (Thermo):
Temperature Significance
240 °C limit for LiF:Mg,Cu,P materials
300 °C limit for PTFE encapsulation
400 °C limit for Kapton encapsulation

Annealing of Harshaw TLD Materials Specifications (Thermo):
For annealing temperatures up to 400 °C, the containers should be made from high temperature stainless steel , oxidized aluminum, preferably thin to assist rapid cooling following annealing. (Do not use non-oxidized aluminum). The use of a dedicated annealing oven reduces the risk of contamination by foreign material. Place the annealing containers on open oven racks with air space all round to avoid inconsistent heat gradients. (Do not stack containers or allow them to touch the oven walls).
EXT-RAD dosimeters


Special features of TLD-100 (LiF:Mg,Ti)

• Nearly tissue-equivalent

• ± 15% sample-to-sample uniformity

• Repeatability to within 2% or better
REFERENCES


1. International Commission on Radiological Protection. General Principles of Monitoring for Radiation Protection of Workers. Publication 35 (Oxford: Pergamon) Ann. ICRP 9(4) (1982).

2. International Commission on Radiological Protection. The 1990–1991 Recommendations of the International Commission on Radiological Protection. Publication 60 (Oxford: Pergamon) Ann. ICRP 21(1–3) (1990).

3. Christensen, P., Julius, H. W. and Marshall, T. O. Radiation Protection 73: Technical Recommendations for Monitoring Individuals Occupationally Exposed to External Radiation. (Luxembourg: Commission of the European Communities) CEC Report EUR 14852 EN (1994).
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