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Radiation Protection Dosimetry 82:131-140 (1999)
© 1999 Oxford University Press

Efficiency Maps of the LLNL and JAERI Realistic Torso Phantoms Using a 70 mm Diameter Germanium Detector and Implications for the Minimum Detectable Activity

G.H. Kramer and B.M. Hauck

Counting efficiency surfaces of the LLNL and JAERI torso phantoms have been determined using a single large area germanium detector at various photon energies (17, 60, 122, and 344 keV) by comparing count rates at many different positions over the torso phantoms' chest plate. The maps can be used to determine the optimum positions for placement of germanium detectors for lung counting and to compare the counting characteristics of the two torso phantoms. The 'efficiency' maps are quite different between the two phantoms at 17 keV; indicative perhaps of how real people will either differ from each other or differ from a calibration phantom. As the photon energy increases the 'efficiency' maps remain distinct, although they are more similar than at 17 keV, showing that the phantoms have different counting efficiency characteristics.


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