Optimization of emission chimney heights for uranium enrichment facility based on individual dose

The individual dose caused by airborne effluents varies with the height of the chimney. In order to reduce the individual dose caused by uranium enrichment facilities, the height of the chimney is optimized, and considering the impact of radioactive effluents within 5 km of the site, the Cairdos program is used to simulate and predict the long-term atmospheric diffusion factors and individual dose distribution.The results showed that ²³⁴U had a greater impact on individual dose contribution, and the long-term dispersion factor and the maximum individualdose appeared in the southeast-east (ESE) direction. The individual dose caused by 10 m, 30 m and 60 m chimneys was 6.78, 3.41 and 1.60 times that of the 80 m chimney, respectively. Therefore, increasing the height of the chimney can effectively reduce the individual dose. The peak value of the individual dose caused by the 150 m and 200 m chimneys was 0.39 and 0.32 times that of the 80 m chimney, respectively. Therefore, When the chimney height is higher than 80m, the extra high chimney can reduce the individual dose, but the decrease of the individual dose is significantly less than the increase of chimney height.