Application of optically stimulated luminescence to the dosimetry of recent radiation events involving low total absorbed doses.

ABSTRACT

We determined the suitability of optically stimulated recombination luminescence in quartz for low-level dosimetry of recent events such as radiation accidents. Minimum detectable doses were determined for both fired and unfired quartz. Using a single aliquot technique, good detection of doses on the order of 0.01 Gy in fired quartz was achieved. In unfired quartz, the minimum dose detected was an order of magnitude larger. Using single aliquot optically stimulated regeneration of a natural quartz sample, a dose of 0.18 +/- 0.02 Gy was measured and was in good agreement with the dose determined by multiple-activation thermoluminescence. Delayed measurements of radiation doses on the order of 1 Gy were shown to be feasible in an emergency response situation when measured up to 7 wk following the irradiation event, using a regeneration-ratio technique. Our conclusions are based on observations of 100 degrees C isothermal decay of the luminescence, high-temperature preheating experiments, thermal fading after prolonged room temperature storage, and observations of the relationship between post-annealing residual luminescence and the TL glow curve. We were able to correlate the optically stimulated recombination luminescence of quartz extracted from building tile with the sample's 278 degrees C TL emission.