摘要
作者测定了博斯腾湖沉积岩心^(210)Pb、^(228)Th和核试验释放核素^(239,240)Pu、~3H的分布,并据^(210)Pb、^(228)Th、^(239,240)Pu的结果估算湖泊的沉积速率,分别为0.31cm/a,0.26cm/a和0.33cm/a。它表明该湖泊近百年来沉积环境十分稳定。沉积物岩心极好地保存了人类大气核试验的历史记录。^(239,240)Pu分布在1963±2出现峰值,与60年代核试验高峰期相当吻合。沉积物孔隙水~3H分布的峰值出现在1969年,与湖水的混合过程有关。
Distributions of 210Pb, 228Th, and the fallout nuclides 239,240Pu and 3H in sedime-tn core from Bosten Lake have been measured. The sedimentation rates based on 210Pb, 228Th, and 239,210pu are 0.31 cm/yr, 0.26 cm/yr and 0.33 cm/yr, respectively. According to 210Pb measurements, the sedimentation rates remain invariable during recent 100 yrs. The sediments of this lake have preserved the historical record of atmospheric nuclear test. 239'240Pu maximum distribution appears in 1963 ± 2, which fits very well with the peak period of nuclear testing during the 1960's. 3H maximum in pore water appears in 1969 as a result of lake water mixing which made it delayed.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第1期63-69,共7页
Geochimica
基金
国家自然科学基金
4880146
