γ-γ coincidence counting system of Cu activation measurement for fusion neutron yield

The direct implosion experiments, in which the grass microballoons are filled with DT fuel, are very successful at Shenguang II laser facility in 2000. One of the ways to measure the fusion neutron yield is the 63Cu activation. The principle of the Cu activation, γ-γ coincidence counting system, its software structure and function, and calibration are presented. After the counting order of the radiated sample counting, saving, data analyzing and treatment, printing of the result and so on are all controlled by the computer, so that the reliability and working efficiency are improved