Measuring the density of coating film using β rays
ZHU Peng-rui，WEN Jie，YAO Yu-hua，LIU Li-jun，KANG Ming-ming，ZHANG Zhi-you
College Physics . 2017, (3): 57 -62 .  DOI: 10.16854 /j.cnki.1000-0712.2017.03.015

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