Azzouzi-Idrissi, M. and Aubert, B. and Chavaudra, J. and Ricard, M. and Tajmouati, J. (2003) Optimizing the use of LiF:Mg,Cu,P (GR-200 P) to measure low dose irradiation in nuclear medicine. Health Physics, 84 (4). pp. 483-491.

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Abstract

We undertook a study in order to determine the optimal conditions under which thermoluminescent powder LiF:Mg,Cu,P (GR-200 P) could be used for applications in nuclear medicine and for dosimetric needs. First, we defined the conditions chiefly related to the readout chain, namely the optimal mass of GR-200 material used for each readout, which is between 15 and 30 mg, and the optimal glow curve readout, which corresponds to heating in two phases: a rise in temperature at the rate of 10°C s-1 up to 150°C followed by a plateau lasting 10 s and then another rise in temperature at the rate of 25°C s-1 up to 260°C followed by a second plateau lasting 6 s. The optimum conditions for using TL material were also studied: using GR-200 P without annealing and performing two successive readouts of the same sample only led to a 0.1 loss in sensitivity per re-use cycle, and the good reproducibility of measurements was preserved with stable and weak residual TL signal. The response of the sample irradiated at three different dose levels with a 60Co gamma photon beam remained constant over 40 d. Sensitivity was preserved to within ±4 between a few tenths of a μGy and 1 Gy. Our observations concur with the results of the literature and show how to optimize the conditions for using the GR-200 thermoluminescent dosimeter to measure low doses with a simple procedure that preserves the sensitivity of material.

Item Type: Article
Uncontrolled Keywords: article; dose calculation; dosimetry; gamma radiation; half life time; irradiation; low energy radiation; nuclear medicine; priority journal; radiation absorption; radiation measurement; reproducibility; signal noise ratio; thermoluminescence, Copper; Gamma Rays; Lithium Compounds; Magnesium; Materials Testing; Nuclear Medicine; Phosphorus; Powders; Quality Control; Radiation Dosage; Radiation Monitoring; Sensitivity and Specificity; Temperature; Thermoluminescent Dosimetry
Subjects: Environmental Science
Divisions: SCIENTIFIC PRODUCTION > Environmental Science
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:48
URI: http://eprints.umi.ac.ma/id/eprint/3595

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