一、放射性示踪沙技术1.示踪方法放射性示踪沙是一种人工制作的玻璃粉末,由于它是选用无硼的玻璃作为氧化钪的载体故称为钪玻璃沙。为了使该种玻璃沙具有与原体沙相同的运动特性,它的比重、粒径和形状应与原体沙相一致。钪玻璃沙的比重为2.66克/厘米~3,中值粒径为0.04毫米,具有不规则形状。图1是杭州湾北岸金山卫海区底沙和放射性示踪沙颗粒级配曲线。由图可见,放射性示 First, the radioactive tracer sand technology 1. Tracer method Radioactive tracer sand is a hand-made glass powder, because it is the choice of non-boron glass as a scandium oxide carrier so called scandium glass sand. In order to make the glass sand with the same movement of the original sand, its specific gravity, particle size and shape should be consistent with the original sand. The scandium glass sand has a specific gravity of 2.66 g / cm 3, a median particle size of 0.04 mm and an irregular shape. Figure 1 shows the sediment concentration distribution curve of sediment and radioactive tracer sand in Weihai, Jinshan, Hangzhou Bay. Can be seen from the figure, radioactive show