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- W2042077500 abstract "Calibration of a lung counter requires the use of a realistic torso phantom. The depth profile of both torso phantoms' (LLNL and JAERI) chest plate covers is fixed and assumed to be equivalent to a person's chest wall; however, ultrasound measurements of humans have shown this to be an approximation. When the depth profile of a calibration phantom is different from that of a subject, then a systematic uncertainty will be introduced into the activity estimate. Monte Carlo simulation has shown that changes in the depth profile of the chest wall thickness affect the counting efficiency. Ultrasound measurements have suggested that the coefficient of variation in the depth profile of the chest wall thickness lies between 13% and 26% for male workers; therefore, the added uncertainty to an activity estimate will be an over or underestimate of about a factor of 1.07 resulting from the different depth profile. The factor will be somewhat higher for females, probably about 1.2 at the extreme. These additional uncertainties resulting from depth profile differences are small compared with other uncertainties commonly encountered in lung counting: detector positioning, deposition patterns of the activity, measurement of the chest wall thickness, etc." @default.
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- W2042077500 date "2000-06-01" @default.
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- W2042077500 title "THE UNCERTAINTY IN THE ACTIVITY ESTIMATE FROM A LUNG COUNT DUE TO THE VARIABILITY IN CHEST WALL THICKNESS PROFILE" @default.
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- W2042077500 doi "https://doi.org/10.1097/00004032-200006000-00019" @default.
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