Performance Test and Evaluation of Fixed Radiation Monitor in Environmental Automatic Monitoring Station
In this paper,the radiation characteristics of 78 high pressure ionization chambers are tested with reference to the metrological technical specification JJF 1733-2018.In the field calibration,88%of ionization chambers meet the response range of 1±0.2;The repeatability of 78 ionization chambers don't exceed 1%,and the response nonlinearity does not exceed 6.5%,which meet the specification requirements.The radiation performance test is carried out for the ionization chamber,and it is found that the measuring range of ionization chamber in 9.0×10-2-1.0×109 μGy/h shall not exceed 1±0.2.The energy response to photons above 164 keV tends to 1.0,and has no response ability below 60 keV.The response curve in range of 60 keV to 164 keV appears"bulge"due to the γ Photoelectric effect of photon and inert gas in ionization chamber.In addition,it does not have the monitoring and warning capability for pulse radiation in nuclear criticality accidents.The response time can give accurate indication in measurement range within 2 s,but response time will be extended to 180-360 s at the junction of segmented voltage.The response change of ionization chamber is less than±0.01 affected by ambient temperature and humidity,showing excellent environmental adaptability.
air kerma ratehigh-pressure ionization chamberradiation performance testresponse
NETL
NSTL
万方数据
维普
