Design of control equipment of reactor sample radiation based on P89C669 MCU

The design of automatic radiation and measuring system for neutron activation analysis and its realization are introduced in this paper.The MCU,P89C669 with ISP function produced by PHILIPS company is choosed as the control center of this system,controlling the sample get in or leave the reactor by the pneumatic-transmmition device.The MCU controls and counts the time of sample's radiation and cooling exactly by photoelectric transducer installed in the entrance of the reactor which examines the sample in the pipeline,and communicates with computer by serial interface,then transmits information of radiation of sample to the computer.The MCU also works in LCD to display the radiation and cooling time dynamicly.