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Instrumentation

Dose Calibrator Linearity Testing Using an Improved Attenuator System

William M. Oswald, Thomas J. Herold, Mark E. Wilson and Joseph C. Hung
Journal of Nuclear Medicine Technology September 1992, 20 (3) 169-172;
William M. Oswald
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota and College of Biological Sciences, University of Minnesota, St. Paul, Minnesota
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Thomas J. Herold
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota and College of Biological Sciences, University of Minnesota, St. Paul, Minnesota
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Mark E. Wilson
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota and College of Biological Sciences, University of Minnesota, St. Paul, Minnesota
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Joseph C. Hung
Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota and College of Biological Sciences, University of Minnesota, St. Paul, Minnesota
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Abstract

Nuclear Regulatory Commission (NRC) guidelines state that dose calibrators must be tested for linearity upon installation and quarterly thereafter over a range of activities from 10 μCi (370 kBq) to the highest dose administered to the patient (300 mCi [11.1 GBq] of iodine-131 for therapy at our institution). The simplest method of linearity testing utilizes commercial attenuator kits. These kits consist of different attenuator tubes plus a central tube that remains in the dose calibrator during the entire testing process. The disadvantage of these kits is that the test has to be performed twice, once with a high activity source and a second time with a lower activity source, to cover the full range of activities required by the NRC. We have designed two accessory tubes that can be used in conjunction with a commercial attenuator system, there by covering the range of activity required by the NRC with a single source of technetium-99m. It takes less than 4 min to complete the entire measurement with this improved linearity test kit.

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Journal of Nuclear Medicine Technology: 20 (3)
Journal of Nuclear Medicine Technology
Vol. 20, Issue 3
September 1, 1992
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Dose Calibrator Linearity Testing Using an Improved Attenuator System
William M. Oswald, Thomas J. Herold, Mark E. Wilson, Joseph C. Hung
Journal of Nuclear Medicine Technology Sep 1992, 20 (3) 169-172;
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Dose Calibrator Linearity Testing Using an Improved Attenuator System
William M. Oswald, Thomas J. Herold, Mark E. Wilson, Joseph C. Hung
Journal of Nuclear Medicine Technology Sep 1992, 20 (3) 169-172;

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