1,002,880. Detecting neutrons. UNITED STATES ATOMIC ENERGY COMMISSION. Aug. 4, 1964 [Oct. 18, 1963], No. 31338/64. Drawings to Specification. Heading G6P. A neutron flux measuring instrument contains a boron-11 sensitive element. This is surrounded by a stainless steel envelope and the current passing between the boron and steel, which is a function of the flux, is measured. The (n,γ) cross-section for boron-11 is less than 0À05 x 10SP-24/SP cm.SP2/SP so that the consumption of this isotope is low. The boron-11 is changed to boron-12 which decays to carbon-12 by #- emission with a short half-life and a maximum energy of 13À4 Me v. Thus, the # current can follow rapid changes in neutron flux and can penetrate large thicknesses of ceramic insulator round the boron.
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机译：1,002,880。检测中子。美国原子能委员会。 1964年8月4日[十月[1963年8月18日]，第31338/64号。图纸按规格。标题G6P。中子通量测量仪包含一个硼11敏感元素。它被不锈钢外壳包围，并测量了在硼和钢之间通过的电流，该电流是通量的函数。硼11的（n，γ）截面小于0‑05 x 10 -24 cm。 2 ，因此该同位素的消耗较低。硼11变为硼12，硼通过＃发射衰变为碳12，半衰期短，最大能量为13‑4 Me v。因此，＃电流可以跟随中子通量的快速变化并可以穿透大厚度的陶瓷绝缘子围绕着硼。
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