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Accumulation of Radium-226 from phosphate fertilizers in cultivated soils and transfer to crops. In: Natural Radiation Environment III. CONF-780422 (Vol. 2) pp. 1667-1682, 1980. A. , Pathways of thirty-seven trace elements through coal-fired power plant. Environ. Sci. Technol. 9 (1975) 973-979. , Yanagisawa, M. , Uranium, Thorium and Potassium contents and radioactive equilibrium states of the U and Th series in phosphate rock and phosphate fertilizers (in Japanese). Radioisotopes (Tokyo) 34 (1985) 529-536.

They could be as low as 2-3 km for short flights and as high as 12 km for intercontinental flights, with intermediate values of 5 - 1 0 k m for medium range and continental flights (Hsu and Weng, 1976; Wachsmann and Regulla, 1978; Wallace, 1975). 7 shows that the dose rate and the dose equivalent rate vary by a factor of 20 between the altitudes of 4 and 12 km. 35 ~tSv h -~, yielding a collective effective dose equivalent to the world population of about 2000 man Sv from air transportation in 1978.

Uranium extraction from Florida phosphates. Nucl. Technol. 53 (1981) 344-353. Markowicz, A. , A modification of the emission-transmission method for the determination of trace elements by XRF. Int. J. Radiat. Appl. Instr. Part A. 43 (1992) 777-779. T. , Radioactivity from fossil-fuel and nuclear plants. In: Environmental Aspects of Nuclear Power Stations, pp. 325-337. IAEA, Vienna, 1971. , Garcia-Leon, M. , The distribution of U, Th and 226Raderived from the phosphate fertilizer industries on an estuarine system in southwest Spain, J.

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