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Standards Development
This standard specifies the monitoring requirements, and methodologies for krypton-85 in the gaseous effluent of nuclear power plants.
This standard specifies instruments and equipment, reagents and materials, analytical procedures, and calculation of results for measuring krypton 85 gas in nuclear power plants by liquid scintillation spectrometer counting method.
This standard is not applicable to environmental sample.
The operation of nuclear facilities is accompanied by the discharge of radioactive materials, which enter the environment through liquid effluent and air-borne effluent, and cause radiation effects to the public. Krypton-85 is the main gaseous radionuclide produced during the operation of nuclear facilities, because it is a long-lived (half-life 10.76 years) beta nuclide, and it is also the main monitoring object in the initial stage of emergency monitoring of nuclear facilities, so it is of great significance to carry out monitoring.
At present, there is no universal international monitoring standard for nuclear power plant effluent krypton 85, and some countries use gamma-spectrum measurement. Because the gamma ray branch emitted by krypton 85 decays is relatively small, only 0.435%, and the detection efficiency of HpGe for gamma ray is low, the exact activity of krypton 85 cannot be measured.
This standard specifies the measurement method of krypton-85 in the gaseous effluent of nuclear power plants, and the detection limit can reach 10Bq/m3, which can effectively improve the accuracy of Krypton 85 monitoring, and is of great significance for the statistics of gaseous effluent emissions of nuclear power plants, public dose evaluation and environmental protection.
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