钚污染土壤的粒度分布特征

Particle Size Distribution of Plutonium Contaminated Soil

研究了钚在我国北方某荒漠土壤中的分布特征。模拟污染土壤经湿法分级后,采用γ谱仪分析各粒级土壤的钚含量。结果表明,近90%的钚存在于0.1～10 mm粒径中,<0.05 mm颗粒中钚含量占总量不足10%,但其再悬浮对生物圈的危害极大,因此不容忽视。钚在土壤各粒级的活度浓度均较高,在清污目标239Pu<4 000 Bq/kg的原则下,普通的湿法分级不能实现假想状况下的该类污染土壤的减容。

Wet classification and γ ray spectroscopy had been applied to study the particle size distribution of Pu in the desert soil of somewhere in Northern China.It was found that nearly 90% of Pu exits in 0.1—10 mm particles,only 10% less in particles under 0.05 mm that still poses notable hazards to biosphere if any resuspension.Providing a decontamination target of 239Pu 〈4 000 Bq/kg,volume reduction for this type of contaminated soil can not be achieved by wet classification under accident condition.