摘要
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 radio nuclides and artificial radio nuclides in soil at Jimunai port, and to provide a scientific basis for improving environmental hygiene of port. Methods Quincunx sampling method was used to gather soil samples in 7 spots of Jimunai port in 2012, Gamma energy spectrum analysis method was used to get the level of radioactivity. The Beck formula was used to estimate absorbed dose rate in air lm above the ground surface, and then annual effective dose of external exposure was calculated. Results The content of 238 U, 226 Ra, 232 Th, 40 K, 137 Cs, and 134 Cs in the soil at Jimunai port were 87.48 Bq/kg, 37.32 Bq/kg, 44.0 Bq/kg, 848.84 Bq/kg, 1.65 Bq/kg and 1.25 Bq/kg, respectively. The content values of natural radio nuclides exceed the average levels of Xinjiang and entire country, the content of 134 Cs and 137Cs was very low. But the annual effective dose of Jimunai was below that of world. Conclusion These show that the radioactive contamination didn＇t occur at port, the local residents and persons leaving or entering the country would not be harmed.
出处
《中国国境卫生检疫杂志》
CAS
2013年第3期192-194,202,共4页
Chinese Journal of Frontier Health and Quarantine
关键词
口岸
土壤
天然放射性
放射性污染
Port
Soil
Natural radioactivity
Radioactive contamination
