摘要
本文报道了1985年鄱阳湖湖底沉积物放射性水平的调查结果。沉积物中 U、Th、^(226)Ra、^(40)(?)和^(137)Cs 的比活度分别为64.8、67.9,58.9、676.1和3.5Bq/kg;用^(137)Cs 测龄方法作了沉积物泥芯垂直深度的年代定位,由此得知1985—1958年对应深度沉积物中 U、Th、^(226)Ra 和^(40)K 的比活度与1957—1930年对应深度沉积物比较无显著性差异;U、Th 和^(226)Ra 的浓集因予分别为5.2×10~413.9×10~4和4.8×10~4L/kg。
This paper presents the investigation results of radioact- ive levels in the sediment at the bottom of Poyang Lake in 1985.Thespecific activities of U,Th,^(226)Ra,^(40)K and ^(137)Cs in the sediment were64.8,67.9,58.9,676.1 and 3.5 Bq/kg,respectively.The ages of verti-cal depth of the soil core of the sediment was determined based on theage measurement method with ^(137)Cs.It was shown that the specific acti-vities of U,Th,^(226)Ra and ^(40)K in the sediment during 1985—1958 werenot obviously different from...
出处
《辐射防护》
CAS
CSCD
北大核心
1989年第5期-,共5页
Radiation Protection
