Radioactivity analysis and discussion of a zircon sand processing plant

Objective: To investigate the radioactivity in raw materials and products in zircon sand processing plants and to grasp the distribution of radioactivity in production processes and its impact on the environment, so as to provide scientific basis for strengthening environmental management and pollution prevention. Methods: The absorbed dose rate in air from γ radiation of raw materials and products were monitored in situ, and the contents of natural radionuclides in raw materials, products and soil samples collected were analyzed. Results: The absorbed dose rates of zircon sand, zirconia and silicon dioxide were 16 ∼ 28 times higher than that of the local natural background. ²³⁸U contents in some samples exceeded the exemption level. The contents of natural radionuclides in the soil samples in the plant area were higher than those in the soil samples outside the plant. The annual effective dose of the worker received from the external radiation was estimated to be 1.24 mSv. Conclusion: The radioactivity level of materials in zircon sand processing is obviously higher than the environmental background level, and it will affect the soil in the plant area. It is necessary to strengthen the management of processing processes and establish a good safety culture to prevent the spread of pollution. (authors)