NF M60-768:2002 Nuclear energy - Measurement of environmental radioactivity - Radon 222 : methods for estimation of the surfacic activity of exhalation by accumulation method.
2012NF M60-768:2012 Measurement of radioactivity in the environment - Air : radon-222 - Part 7 : accumulation method for estimating surface exhalation rate.
2002NF M60-768:2002 Nuclear energy - Measurement of environmental radioactivity - Radon 222 : methods for estimation of the surfacic activity of exhalation by accumulation method.