The error source in measuring neutron fluence rate is gived . the efficiency of u - fission chamber is studied . the effect factors to detector are analyzed and experimentally studied
2.
The effect of detector disturb and the shell of the detector and construction material is not distinct . the low absorb cross section material is used to 235u - fission chamber . the low z material is used in experimental bracket and shielding material and the material is used less
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