Study on Indoor Air Radon Measurement in a University in Shanghai Haoquan Ni, Minyi Pan, Yanmei Yin, Jingyu Chen, Zhijun Zou, Hao Li, Chanjuan Sun and Chunxiao Su E3S Web Conf., 356 (2022) 05036 Published online: 31 August 2022 DOI: 10.1051/e3sconf/202235605036