利用短脉冲激光对退役中放管道内表面沉积的放射性进行了清洗,实现了大于200倍的放射性活度去污系数,并通过激光逐层剥离获得了放射性活度在不锈钢管道内壁的深度分布(图1)。实验证实,管道内表面的放射性主要分布在表面沉积层中,但部分放射性活度已经扩散至管道基材的亚表面。 The short-pulse laser was used to wash the radioactivity deposited on the inner surface of the re-release medium pipe and the radioactivity was more than 200 times, and the depth distribution of the radioactive activity on the inner wall of the stainless steel pipe was obtained figure 1). Experiments show that the radioactive surface of the pipe is mainly distributed in the surface sedimentary layer, but part of the radioactive activity has been spread to the sub-surface of the pipe substrate.