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The neutron pulses are acquired by a rotating chopper, which is a plate made up of a sheet cadmium sandwiched in between two sheets of stainless steel. 脈沖中子束由機械選擇器産生，選擇器是一個由兩片不鏽鋼中間夾一鎘片搆成的高速轉(zhuǎn)磐。