U.K. National Radiological Protection Board Radon Calibration Procedures.
A procedure for the calibration of instruments for the detection of222Rn in air is described. The method is based on the alpha-spectrometric determination of the concentration in air of218Po in the calibration chamber. The calibration chamber is described, together with the method of maintaining a high aerosol concentration. The218Po concentration at steady state in the chamber is found to be 98% of the222Rn concentration typically. An assessment of the sources of uncertainty in the method presented indicate that the222Rn concentration in the chamber can be determined with an overall uncertainty of about 7% at the 95% confidence level.
National Radiological Protection Board, Chilton, Didcot, Oxon, OX11 ORQ, U.K.
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aerosol generation; alphaspectrometry; calibration chamber; radon daughter measurement; radon gas measurement; statistical uncertainty