Development of integrated whole body counter.
Instead of conventional human counter using NaI(Tl) scintillator in scanning bed geometry, integrated whole body counter was developed. This is constituted by 10 detectors that are located just above the objective organs in order to improve the identification of nuclides. Two sets of p-type arrayed planar HPGe detectors composed of two crystals are used for lungs, and two sets of p-type high efficiency coaxial HPGe detectors are used for gastrointestinal tract. Similarly n-type HPGe is used for chest or thyroid or skull and the other p-types are used for the liver and kidney, respectively. An electric cooling system by adiabatic expansion was adapted as cooling apparatus for all detectors with the object of asphyxia prevention and continuous operation. In the efficiency calibration, Japan Atomic Energy Research Institute (JAERI) phantom with newly designed tissue equivalent lungs, which contain 241Am homogeneously distributed, was applied to lung detector, and Bottle Manikin Absorbtion (BOMAB) phantom regulated by American National Standards Institute (ANSI) was also applied to detectors for trunk.
Department of Radiation Dosimetry, Research Center for Radiation Emergency Medicine, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. t-suzuki@nirs.go.jp
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Suzuki
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Nakano
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Kim
D004867:Equipment Design; D019544:Equipment Failure Analysis; D007564:Japan; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000295:instrumentation*; D012680:Sensitivity and Specificity; D018511:Systems Integration; D014915:Whole-Body Counting / Q000295:instrumentation* / Q000379:methods