On this day, 39 years ago, on November 5, 1986 (October 4, 1986, the lunar calendar), my country's first nuclear scale was successfully developed. In early November 1986, the nuclear weighing system (referred to as the nuclear scale) successfully developed in China by the Institute of Technical Physics of the Heilongjiang Province Academy of Sciences has recently passed the appraisal. Nuclear scales are a national scientific and technological key project. It is a kind of equipment for continuously and dynamically weighing solid bulk materials on various types of conveyors based on nuclear technology principles and modern microcomputer control. It can be widely used in industrial and mining, grain, ports and other departments.