title: Effect of a grounded object on radon measurement using AlphaGUARD.
abstract: ABSTRACT-: The effects on radon concentration measurement of a grounded object near the opening of a cylindrical ionization chamber were studied using AlphaGUARD. AlphaGUARD comes with a flow measurement adapter that fits on the front of the AlphaGUARD ionization chamber. If the adapter nozzle is grounded, the radon concentration is falsely measured at 0 Bq m. A metal connector for use between the AlphaGUARD and the air duct wall was manufactured in our laboratory. When the connector is grounded, the radon concentration is again falsely measured as 0 Bq m. If the nozzle or connector is ungrounded, the AlphaGUARD measures radon concentration accurately. Health Phys.
authors.affiliation: Radon Research Group, Research Center for Radiation Safety, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan. tsubo@nirs.go.jp
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Ichitsubo
authors.forename: Yuji
authors.initials: Y
authors.lastname: Yamada
mesh_terms: D000512:Alpha Particles; D004560:Electricity; D004581:Electronics; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods*; D004868:Equipment Failure; D019544:Equipment Failure Analysis / Q000379:methods*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D011886:Radon / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055672:Static Electricity
chemical_list: D011886:Radon