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Field calibration device for environmental gamma radiation air specific kinetic energy rate monitor
With the popularization of radiation environment monitoring, more and more gamma dose rate monitors are needed for on-site calibration and verification. The on-site calibrating device of environmental gamma radiation air specific kinetic energy rate monitor developed by our company can meet the needs of users on-site detection. Meet the requirements of metrological verification regulation JJG 521-2006 "X and gamma radiation air specific kinetic energy absorption rate meter" for environmental monitoring.
technical parameter：
1 reference radiation: 137Cs, the radiation source activity is about 400 MBq (10%, k = 2).
2 source container: through control, 3 stalls can be switched, and the source container should include 3 tungsten attenuators of different thickness.
3 the range of measurement: (0.10~20) mu Sv/h.
4 calibration distance: (1.0~5.0) M
5 stability: under the same temperature and air pressure, when the calibration distance is within the range of (1.0~5.0) M: 1) when the air ratio of the irradiated field is greater than 1 u Sv H-1, the relative standard deviation of the air specific release energy is not more than 3%; 2) the air ratio of the irradiated field is less than or equal to 1 mu Sv H-1, and the air is tested repeatedly and the air is more than released. The relative standard deviation of the energy rate is not more than 5%.
6 scattering: within the calibrated distance of (1.0~5.0) m, the air ratio of different positions on the axis of the ray beam is measured. After the air is weakened, the air is proportional to the inverse of the release energy within 5% and the square of the center of the radiation source to the center of the detector.
7 homogeneity: the calibration distance is 2 m far away, take the point test in the range of 50 cm field, and the relative standard deviation of air relative release rate is not more than 5%.