Neutron Count Rate Change for Detectors at Different Positions in Venus 1# Sub-critical Assembly

Relative neutron count rate change was studied on Venus 1# sub-critical assembly for the detectors at different positions of the core with external neutron source, Am-Be neutron source and ²⁵²Cf neutron source respectively. The experimental results show that neutron count rate changes for the detectors at different positions are different on Venus 1# sub-critical assembly, but it’s little effect on the results of sub-critical extrapolate experiment.