Time‐dependent calculations of the vertical distribution of <sup>222</sup>Rn and its decay products in the atmosphere

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<jats:p>A model has been developed to simulate the one‐dimensional time‐dependent vertical diffusion of <jats:sup>222</jats:sup>Rn and its decay products in the atmosphere. Computed activities and activity ratios as a function of height above the ground are in excellent agreement with experimental data. The simulations indicate that near the air‐ground interface a quasi steady state is reached within a few hours after establishment of a particular atmospheric mixing regime. Radioactive equilibrium between radon and its short‐lived daughters is approached at all heights except for very close to the ground during weak mixing conditions.</jats:p>

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