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激光与等离子体相互作用的物理过程的研究是激光核聚变工作的基础。用短脉冲大功率激光辐照含氘材料引发聚变反应产生中子,是激光加热等离子体的主要手段。用铑激活计数器测量激光加热等离子体产生的中子产额,其工作原理如下:大功率短脉冲激光加热等离子体,发射快中子;快中子经过慢化剂,慢化成热中子;丰度为100％的如~(103)Rh,以截面σ_γ=139bar为热中子激活成~(104)Rh;~(104)Rh半衰期T_(1/2)=42.3sec,
The study of the physical process of laser-plasma interaction is the basis of laser fusion. The use of short-pulse high-power laser irradiation of deuterium-containing material induces fusion reactions to produce neutrons, which is the main means of laser heating the plasma. Using a rhodium activation counter to measure the neutron yield produced by laser heating of the plasma, the principle of operation is as follows: a high power short pulse laser heats the plasma and emits fast neutrons; the fast neutron slows down to a modest neutron; (104) Rh; ~ (104) Rh half-life T 1/2 (1/2) = 42.3sec,