中子流，核爆炸初期释放出的大量中子所形成的粒子流。是早期核辐射的组成部分，有较强的穿透能力，对人畜的机体、电子设备等有较大的破坏作用。
本文论述了地-空界面上天然宇宙中子流的来源；
The origins of natural neutron flux on the air-ground interface are described in this paper.
研究堆中水平辐照孔道用以从堆芯附近引出高能中子流。
Horizontal radiation ducts in research reactors are used to reduce the high energy neutron flux from near the core.
初步进行了宇宙中子流的测量，结果表明：在不同的气象条件下，宇宙中子流呈现有规律的变化。
Some preliminary works were done in measuring cosmic neutron current. The results show that cosmic neutron currents change regularly in different meteorological conditions.
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