Abstract: To understand the environmental radiation status in Urumqi, we monitored ⁷Be and ⁴⁰K levels in fallout from 2017 to 2021. It showes that the 5-year average of ⁷Be is 1.94 Bq/(m²·d), with the maximum of 2.8 Bq/(m²·d) and the minimum of 1.1 Bq/(m²·d). For ⁴⁰K, the results are 354.3, 1 050, and 104 mBq/(m²·d) respectively. Both radionuclides are at normal natural levels, and the 5-year measurements are basically stable.

Key words: fallout, ⁷Be, ⁴⁰K