85Kr惰性气体监测仪的现场校准方法研究

iming at the calibration problems of krypton-85 noble gas monitor, such as difficult disassembly, continuous operation, lack of standard equipment for value transfer, efficiency calibration only via traditional method, based on gas diffusion theory this paper designs krypton-85 on-site calibration method and defines the conventional true value of krypton-85.On-site calibration device was developed. Besides, the on-site application of the device was completed and the performance of some krypton-85 noble gas monitors was evaluated. The results show that the device can provide krypton-85 activity concentration between 1.0105 Bqm-3 and 1.01010 Bqm-3, the relative extend uncertainty of 6.8%-9.0% (k=2). At present, there are problems with small measuring range and large nonlinear deviation of high krypton-85 activity concentration response in the use of noble gas monitors.