低温环境空气中氚化水蒸气的采样方法探讨
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摘要
目的建立一种适合低温(-15℃~5℃)环境下空气中氚化水蒸气的采样方法,为北方核电厂外围环境空气中氚化水蒸气的监测提供技术支持。方法以3A分子筛为吸附材料,采用主动抽气法采集室外环境空气中的水蒸气,用于环境空气中氚化水蒸气样品的采集,并对采样速率、效率、记忆性等进行了优化和测试,验证方法的适用性。结果采样速率在1.0~3.0 L/min时采样效率大于99%,采样方法记忆效应约3%。结论该采样方法可以实现冬季低温环境空气中氚化水蒸气样品的采集。
Objective To establish a suitable method for collecting tritiated water vapor in air in low-temperature environment(-15 ℃ ~ 5 ℃),and to provide technical support for monitoring tritiated water vapor in the ambient air surrounding nuclear power plants in the north. Methods Taking 3 A molecular sieve as the adsorbent,and using the pump to sample the tritiated water vapor in the ambient air. The performances of sampling rate,efficiency,memory effect were tested and optimized for the better applicability. Results At a flow rate from 1. 0 L/min to 3. 0 L/min,the sampling efficiency was larger than 99%,and the memory effect was about 3%. Conclusion The method is applicable for collecting tritiated water vapor in low temperature environment in winte.
Objective To establish a suitable method for collecting tritiated water vapor in air in low-temperature environment(-15 ℃ ~ 5 ℃),and to provide technical support for monitoring tritiated water vapor in the ambient air surrounding nuclear power plants in the north. Methods Taking 3 A molecular sieve as the adsorbent,and using the pump to sample the tritiated water vapor in the ambient air. The performances of sampling rate,efficiency,memory effect were tested and optimized for the better applicability. Results At a flow rate from 1. 0 L/min to 3. 0 L/min,the sampling efficiency was larger than 99%,and the memory effect was about 3%. Conclusion The method is applicable for collecting tritiated water vapor in low temperature environment in winte.
引文
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[2]陈前远,龚传德,胡丹,等.核电厂外围辐射环境监测中空气中氚的取样方法初探[J].核电子学与探测技术,2012,32(11):1348-1352.
[3]杨怀元.氚的安全与防护[M].北京:原子能出版社,1997:197-199.
[4]潘自强.电离辐射环境监测与评价[M].北京:原子能出版社,2007:414-419.