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目的研究吉木乃口岸天然放射性和人工放射性核素含量的情况,为口岸卫生环境改善提供科学依据。方法2012年采用梅花采样法采集吉木乃口岸7处土壤样品,利用γ能谱分析方法得出放射性水平并采用Beck公式法估算出离地面1 m高处的空气吸收剂量率,并计算外照射年有效剂量。结果吉木乃口岸土壤中天然放射性核素铀238、镭226、钍232、钾40和人工放射性核素铯137、铯134含量均值分别为:87.48 Bq/kg、37.32 Bq/kg、44.78Bq/kg、848.84 Bq/kg、1.65 Bq/kg、1.25 Bq/kg;天然放射性核素含量均高于新疆和全国的平均水平,但年有效剂量率低于世界平均值。人工放射性核素铯137、铯134含量水平较低。结论吉木乃口岸土壤的放射性危害较小,对当地居民和进出境人员不会产生辐射伤害。
Objective To study the contents of natural radioactive and artificial radionuclides in Jimnun Port and provide a scientific basis for the improvement of port health environment. Methods In 2012, plum blossom was used to collect seven soil samples at Jimunai Port. The radioactivity level was obtained by γ-ray spectroscopy and the air dose rate at 1 m above the ground was estimated by Beck’s method. Effective dose. Results The average contents of natural radionuclides uranium 238, radium 226, thorium 232, potassium 40 and artificial radionuclides cesium 137 and cesium 134 in the soil of Jimunai Port were 87.48 Bq / kg, 37.32 Bq / kg and 44.78 Bq / kg respectively , 848.84 Bq / kg, 1.65 Bq / kg and 1.25 Bq / kg respectively. The content of natural radionuclides was higher than the average in Xinjiang and the whole country, but the annual effective dose rate was lower than the world average. Artificial radionuclides cesium 137, cesium 134 levels lower. Conclusion The radioactivity of soil in Jimunai Port is less harmful and will not cause radiation damage to local residents and entry and exit personnel.