Abstract:A 14CO2-measuring system for breath-analysis tests is described which utilizes plastic-scintillator filaments as radiation-detector elements. The 14C radioactivity in expired breath is measured directly, thus eliminating the need for trapping and counting of liquid scintillation-counting solutions. Total CO2 concentration in expired breath is measured by an infrared detector, making no assumption of endogenous CO2 output and enabling results to be expressed as either a concentration (percentage of administered… Show more
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