土壤氡测定的影响因素探讨

目的 探讨土壤氡的测定方法,试图找出影响土壤氡测定结果准确性相关因素,为制定有效的测定方法提供依据。方法 采用抽气-电离室法。结果 土壤氡浓度随采样体积增加而增加;在一定范围里也随测量深度而增加;采样深度达60cm以上时,土壤氡浓度变动较小;抽气时间影响不太明显;微波会对结果有严重影响;雨后测定结果偏低;植被对测定结果有一定的影响。测量仪器用干燥剂受潮使测定结果降低。结论 采样体积、深度、微波振动、土壤湿度、植被等因素影响测量结果,选择最佳采样和测量条件,才能较好地保证测定结果的准确性。

Study on the Influence Factors about the Soil Radon Measurement

Objective To explore relevant factors about the soil radon measurement and provide gist of formulating correct measure method by studying the way of the soil radon measurement. Methods Deflation-ionization room standard is adopted. Results The concentration of soil radon becomes higher with the sample's volume added, it also augmented with the measure depth increased in certain degree; The concentration of soil radon changes little when sample's depth is above 60cm; The time of deflation has no obvious influence on the concentration of soil radon, but microwave show serious effect on it; The results will be lowered when the desiccant is humidified, raining has the same affection on it; Plant has some impact on it. Conclusion The measured results will be affected by microwave, oscillate and plant. Sample's volume and depth, soil's humidity can influence it too. The result's veracity can be guaranteed by choosing appropriate sample and measure condition.