Recent trends and explanation for airborne 137Cs activity level increases in France O. Masson, D. Piga, G. Le Roux, J. Mary, A. de Vismes, R. Gurriaran, Ph. Renaud, L. Saey and P. Paulat Radioprotection, 44 5 (2009) 327-332 Published online: 06 June 2009 DOI: 10.1051/radiopro/20095064