High Dose Dosimetry Using Optically Stimulated Luminescence

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Abstract
Very precise high level dosimetry is currently being accomplished using electron spin resonance (ESR) of the radiation damage centres in alanine. While the technique works well, the complications and cost of using ESR machines could be simplified by using optically stimulated luminescence (OSL) techniques. Battelle, in collaboration with Landauer, Inc., has been developing low cost OSL polymer detectors manufactured by either injection moulding or extrusion. LiF and Al2O3 are the OSL active materials that are uniformly mixed with a polymer prior to dosemeter fabrication. Grain sizes of the LiF are usually kept below 10 µm in order to disperse the material uniformly. Plastic manufacturing techniques readily produce uniform detectors. The aim of the project is to produce an inexpensive detector that covers the range of 10 R-106 R. Readout is accomplished using a laser or light source to excite the OSL radiation damage centres. Luminescence of the OSL radiation damage centres is measured by optical filtration of the laser or light source. The method of fabrication, readout techniques, and dosimetric response of the new detectors are presented.

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