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Eur J Nucl Med Mol Imaging (2011) 38 (Suppl 2):S260–S441 DOI 10.1007/s00259-011-1911-0POSTER PRESENTATIONSP02 — Sunday, October 16, 2011, 16:00 — 16:30, , NIA Exhibition AreaPhysics & Instrumentation & Data Analysis: Image P01 — Sunday, October 16, 2011, 16:00 — 16:30, NIA Exhibition AreaPhysics&Instrumentation&DataAnalysis:InstrumentationP001 Comparison of three techniques for calculating the 20% count rate loss in a gamma probe for sentinel node biopsy surgery K. L. Kirkbride, A. G. Irwin, T. Hague, A. J. Craig, A. Britten; St George's Hospital, London, UNITED KINGDOM. AimTo compare two standard methods (“decaying source” and “two-source” methods) for measuring count rate performance in gamma probes with a new method (“distance method”), and to evaluate the tests for their suitability as part of routine QA procedures.IntroductionCharacterisation of the count rate capability due to dead time is a component of gamma probe QA. Dead time reduces the recorded counts and QA measurements mu...