long counter
... london superconductor伦敦超导体 long counter长计数管 long focus lens长焦距透镜 ...
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用铁片活化法和长计数管测量中子发生器的中子产额，给出了测量方法和结果。
Yields of neutron generators have been measured by the iron foil neutron activation method and a long counter separately. The methods and results are given.
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