U.K. National Radiological Protection Board Radon Calibration Procedures
نویسنده
چکیده
A procedure for the calibration of instruments for the detection of 222Rn in air is described. The method is based on the alpha-spectrometric determination of the concentration in air of 218Po in the calibration chamber. The calibration chamber is described, together with the method of maintaining a high aerosol concentration. The 218Po concentration at steady state in the chamber is found to be 98% of the 222Rn concentration typically. An assessment of the sources of uncertainty in the method presented indicate that the 222Rn concentration in the chamber can be determined with an overall uncertainty of about 7% at the 95% confidence level.
منابع مشابه
Quality management in the NHS: the doctor's role--II.
of the Natizonal Radilological 43 National Radiological Protection Board. Board statement on radon in homes. Protection Board, 1991. Documents of the National Radiological Protection Board 1990;1(1). 41 International Commission on Radiological Protection. Lung cancer risk from 44 Department of the Environment. 7'he householder's guide to radon. 2nd ed. indoor exposure to radon daughters. ICRP p...
متن کاملRadon and monocytic leukaemia in England.
The relationship between the standardised registration ratio (SRR) for monocytic leukaemia and the radon concentration by county in England was investigated. Leukaemia data were obtained from the OPCS and cover the age range 0-74 years and the period 1975-86. Radon concentrations were obtained from a recent National Radiological Protection Board report. A significant correlation was observed be...
متن کاملRadon Measurement Standards and Calibration
This issue of the Journal of Research of the National Institute of Standards and Technology resulted from a one-half day seminar devoted to descriptions of the current status of the metrology of radon in international laboratories specializing in that area. The seminar, held June 5, 1989, at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Federal Republic of Germany was co-sponso...
متن کاملIntercomparison of radon CR-39 detector systems conducted in CLOR’s calibration chamber
Within the framework of the grant of the Polish Ministry of Science and Higher Education entitled Seasonal changes of indoor radon (222Rn) concentrations of Poland (N506 1127 33) radon laboratories united in the Radon Center – the Non-governmental International Scientific Network – perform measurements of radon concentration in houses located in various areas of Poland. These laboratories belon...
متن کاملCalibration of Scintillation Cells for Radon-222 Measurements at the U.S. Environmental Protection Agency
Zinc sulfide coated scintillation cells are the primary method for measuring radon-222 at the U.S. Environmental Protection Agency (EPA), Office of Radiation Programs (ORP), Eastern Environmental Radiation Facility (EERF). These cells are used to measure concentrations of radon in exposure chambers that are used to calibrate or test other devices or instruments. Individual cells are calibrated ...
متن کامل