Study on radioactivity level of carbon-14 in air of Haiyang City
ZHAO Xinjing, LIU Wenna, XU Kaiyan, XU Qian, DING Hongshen
中国辐射卫生 . 2019, (3): 296 -298 .  DOI: 10.13491/j.issn.1004-714x.2019.03.021