The influencing factors of gamma air-absorbed dose rate are studied to improve the precision of environmental radiation monitoring data. Background radiation measurement, increasing of the radon concentration and changing of humidity are done to discuss the two major influencing factors, I. e. the concentration and relative humidity of radon and radon progeny in the air. The radon concentration in the air are measured with scintillation radon monitor ( ZnS ( Ag) ) , electronic radon detector ( RAD7 ) and ionization chamber radon detector ( Alpha-GUARD) , and gamma air-absorbed dose rate with X--y dose rate meter (CKL-3120). The gamma air-absorbed dose rate, radon concentration, temperature, relative humidity and atmospheric pressure in the air are monitored together. Results show gamma air-absorbed dose rate indicates a poor correlation with radon concentration and relative humidity of the air.%为提高辐射环境监测数据的准确度,对空气伽马吸收剂量率影响因素进行了研究.针对空气伽马吸收剂量率两个主要影响参数一空气氡及其子体浓度和相对湿度,分另別进行了室内外本底测量、增加氡浓度和改变相对湿度实验.采用闪烁室测氡仪(ZnS(Ag)型)、静电收集室测氡仪(RAD7)和电离室测氡仪(AlphaGUARD)测量空气氡浓度,用X-γ剂量率仪( CKL-3120)测量空气伽马吸收剂量率.联合观测空气伽马吸收剂量率、空气氡浓度、温度、相对湿度和大气压强,实验结果表明:空气氡浓度、相对湿度与空气伽马吸收剂量率呈现弱的正相关.
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