中子寿命是指热中子密度降至一半所用的时间。
Neutron lifetime is the time in which the thermal neutron density falls to half.
对于长寿命裂变产物核素热中子反应截面测量，除了上述意义外，在废物处理处置方面也具有实际应用价值。
The measurement of thermal neutron cross sections of long-lived fission products (LLFPs) also has practical application value in nuclear waste disposal.
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