This paper presents the results of atmospheric radioactivity monitoring over the Czech Republic, as obtained by the Radiation Monitoring Network, following the Fukushima Dai-Ichi Nuclear Power Plant accident. Maximum values for (131)I were 5.6 mBq m(-3) in aerosol form and 13 mBq m(-3) in gaseous form. The maximum values for (134)Cs and (137)Cs were 0.64 and 0.72 mBq m(-3), respectively. The estimated effective half-time for removing the activity from the atmosphere was 6-7 d and 3.5 d for caesium and iodine, respectively. The gaseous-to-total activity ratios of (131)I ranged between 0.3 and 0.9, with an arithmetic mean value of 0.77. The mean value for the (134)Cs/(137)Cs ratios was close to 1.0. The effective inhalation dose due to the accident for an adult living in the Czech Republic was estimated at <4 × 10(-5) mSv, out of which the proportion of (131)I was 88%.

National Radiation Protection Institute Bartoškova 28 140 00 Praha 4 Praha Czech Republic

Regional Center of the State Office for Nuclear Safety Schneiderova 32 370 07 České Budějovice Czech Republic

State Office for Nuclear Safety Senovážné náměstí 9 Praha 1 Praha Czech Republic

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$a Rulík, Petr $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Monitoring radionuclides in the atmosphere over the Czech Republic after the Fukushima Nuclear Power Plant accident / $c P. Rulík, M. Hýža, V. Bečková, Z. Borecký, J. Havránek, Z. Hölgye, J. Lušňák, H. Malá, J. Matzner, H. Pilátová, J. Rada, E. Schlesingerová, E. Šindelková, L. Dragounová, J. Vlček,

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$a This paper presents the results of atmospheric radioactivity monitoring over the Czech Republic, as obtained by the Radiation Monitoring Network, following the Fukushima Dai-Ichi Nuclear Power Plant accident. Maximum values for (131)I were 5.6 mBq m(-3) in aerosol form and 13 mBq m(-3) in gaseous form. The maximum values for (134)Cs and (137)Cs were 0.64 and 0.72 mBq m(-3), respectively. The estimated effective half-time for removing the activity from the atmosphere was 6-7 d and 3.5 d for caesium and iodine, respectively. The gaseous-to-total activity ratios of (131)I ranged between 0.3 and 0.9, with an arithmetic mean value of 0.77. The mean value for the (134)Cs/(137)Cs ratios was close to 1.0. The effective inhalation dose due to the accident for an adult living in the Czech Republic was estimated at <4 × 10(-5) mSv, out of which the proportion of (131)I was 88%.

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$a Hýža, Miroslav $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic miroslav.hyza@suro.cz.

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$a Bečková, Věra $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Borecký, Zdeněk $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Havránek, Jiří $u Regional Center of the State Office for Nuclear Safety, Schneiderova 32, 370 07 České Budějovice, Czech Republic.

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$a Hölgye, Zoltán $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Lušňák, Jan $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Malá, Helena $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Matzner, Jan $u State Office for Nuclear Safety, Senovážné náměstí 9, Praha 1, Praha, Czech Republic.

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$a Pilátová, Helena $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Rada, Jiří $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Dragounová, Lenka $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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$a Vlček, Jaroslav $u National Radiation Protection Institute, (SÚRO), Bartoškova 28, 140 00 Praha 4, Praha, Czech Republic.

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