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Radiation Protection Dosimetry Advance Access originally published online on November 23, 2004
Radiation Protection Dosimetry 2005 113(1):70-74; doi:10.1093/rpd/nch421
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Published by Oxford University Press 2004

Radon monitor calibration using NIST radon emanation standards: steady flow method

P. Kotrappa1,*, L. R. Stieff1 and P. Volkovitsky2

1 5714-C Industry Lane, Frederick, MD 21704, USA
2 National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

* Corresponding author: PKotrappa{at}aol.com

The National Institute of Standards and Technology (NIST) polyethylene-encapsulated 226Ra/222Rn emanation (PERE) standards (old SRM 4968 and new SRMs 4971, 4972, and 4973) provide precise radon emanation rate, certified to a high degree of accuracy (approximately to 2%). Two new SRM 4973 standards containing totally 1036 Bq (0.028 µCi) of 226Ra, emanate 0.114 Bq (3.08 pCi) of 222Rn per min. Air passing over such sources at a flow rate of 1 l min–1 will have a radon concentration of 114 Bq m–3 (3.08 pCi l–1). This paper describes a practical calibration system and the actual calibration verification data obtained at different flow rates, for E-PERM® passive radon monitors, Femto-Tech® and Alpha Guard® Continuous Radon Monitors. The use of such an affordable and easy to use system by the manufacturers and users of radon measurement devices will bring uniform standards with traceability to a NIST standard source and is considered an important step in standardising radon measurement methods.


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