Abstract
The previously developed function that fits counting efficiency to chest wall thickness, adipose content of the chest wall, and photon energy was previously shown to be valid only over the energy range 17 keV to 344 keV. The validity of this function has been tested for a wider energy range, 17 keV to 1408 keV by testing it on experimental data sets generated by the Centro de Investigaciones Energeticas Medicambientales y Tecnologicas and by the Carlsbad Environmental Monitoring Research Centre. Both facilities used their Lawrence Livermore National Laboratory torso phantom and associated overlay plates with their germanium detector lung counting systems. The function has been validated over the extended energy range and the ratio of calculated to observed counting efficiency varies from 0.92 to 1.14.
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