Radionuclides from the reactor accident Fukushima Daiichi nuclear power plant were observed in the airborne aerosols at CTBT International Monitoring System (IMS) stations (MRP43, CMP13) in Africa. The maximum activity concentrations in the air measured in Mauritania were 186.44 10 Bq.m, 264.16 10 Bq.m and 1269.94 10 Bq.m for Cs, Cs and I respectively, and in Cameroon 16.42 10 Bq.m, 25.53 10 and 37.58 10 Bq.m respectively for Cs, Cs and I. The activity ratio of Cs/Cs is almost constant throughout the period of time relevant to this study due to their long half-lives of 30.2 years for Cs and 2.06 years for Cs. Whereas the I/Cs activity ratio varies in time according to the radioactive decay with a half-live of 8.06 days for I and different removal rates of both radionuclides from the atmosphere during transport. The EMAC atmospheric chemistry-general circulation was used to simulate the emission and transport of the isotope Cs and map the deposition of the Cs deposition over Africa.
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