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Comparison between beta radiation dose distribution due to LDR and HDR ocular brachytherapy applicators using GATE Monte Carlo platform.
Phys Med
August 2016
Laboratory of Nuclear Science and Radiation-Matter Interactions (LSNIRM) USTHB, Bab Ezzouar 16111, Algiers, Algeria; Laboratory of Theoretical Physics and Radiation-Matter Interactions (LPTHIRM) USDB, Soumaa 09000 Blida, Algeria.
Eye applicators with 90Sr/90Y and 106Ru/106Rh beta-ray sources are generally used in brachytherapy for the treatment of eye diseases as uveal melanoma. Whenever, radiation is used in treatment, dosimetry is essential. However, knowledge of the exact dose distribution is a critical decision-making to the outcome of the treatment.
View Article and Find Full Text PDFCalibration of the 90Sr+90Y ophthalmic and dermatological applicators with an extrapolation ionization minichamber.
Appl Radiat Isot
February 2014
Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242, 05508-000 São Paulo, SP, Brazil.
(90)Sr+(90)Y clinical applicators are used for brachytherapy in Brazilian clinics even though they are not manufactured anymore. Such sources must be calibrated periodically, and one of the calibration methods in use is ionometry with extrapolation ionization chambers. (90)Sr+(90)Y clinical applicators were calibrated using an extrapolation minichamber developed at the Calibration Laboratory at IPEN.
View Article and Find Full Text PDFThin CaSO4:Dy thermoluminescent dosimeters for calibration of 90Sr+90Y applicators.
Appl Radiat Isot
April 2012
Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil.
Clinical applicators are used in brachytherapy to treat superficial lesions of skin and eye. They should be periodically calibrated according to quality control programs and international recommendations. Thin CaSO(4):Dy thermoluminescent dosimeters were used to calibrate various applicators with a dermatological applicator as a reference.
View Article and Find Full Text PDFOphthalmic applicators: an overview of calibrations following the change to SI units.
Med Phys
May 2009
Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
Since the NIST dose to water standard for 90Sr/90Y ophthalmic applicators was introduced, numerous sources have undergone calibration either at NIST or at the University of Wisconsin Accredited Dosimetry Calibration Laboratory (UWADCL). From 1997 to 2008, 222 of these beta-emitting sources were calibrated at the UWADCL, and prior reference source strength values were available for 149 of these sources. A survey of UWADCL ophthalmic applicator calibrations is presented here, demonstrating an average discrepancy of -19% with a standard deviation of +/- 16% between prior reference values and the NIST-traceable UWADCL absorbed dose to water calibrations.
View Article and Find Full Text PDFA special mini-extrapolation chamber for calibration of 90Sr+90Y sources.
Phys Med Biol
June 2005
Instituto de Pesquisas Energéticas e Nucleares, Commissão Nacional de Energia Nuclear, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, SP, Brazil.
90Sr+90Y applicators are commonly utilized in brachytherapy, including ophthalmic procedures. The recommended instruments for the calibration of these applicators are extrapolation chambers, which are ionization chambers that allow the variation of their sensitive volume. Using the extrapolation method, the absorbed dose rate at the applicator surface can be determined.
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