关键词20：核材料“一克不丢、一件不少”

中国对核材料实施许可证制度，要求任何单位在生产、 持有、使用、运输、处理核材料时必须采取实物保护、衡 算与控制等措施。按照国际原子能机构最新建议开展新建 核设施的核安保系统建设，投入数十亿元专项资金改造升 级原有核设施安保系统，安全防范能力大幅加强。迄今为 止，未发生核材料被盗、丢失或非法使用事件，做到了重 要核材料“一克不丢、一件不少”。

Keyword 20：Keeping Nuclear Material Under Lock and Key

A licensing system is applied to all activities related to nuclear material. Entities involved in production, possession, use, transportation and handling of nuclear material are required to take measures to ensure adequate physical protection and control of and accounting for nuclear material. Nuclear security systems have been built at new nuclear facilities in accordance with the latest recommendations of the International Atomic Energy Agency (IAEA), and billions of yuan have been invested in upgrading the security systems at existing nuclear facilities. These moves contribute significantly to enhanced security. To date, there have been no incidents of theft, loss or illegal use of important nuclear material.