在城市地区使用低分辨率马光谱仪测量Be-7
Angelo Zanona Neto1, Rodrigo Oliveira Bastos1, Bruno Winicius Borsoi1
1Nuclear Applications Laboratory, Unicentro, Guarapuava, 85040-167, PR, Brazil.
概括
柏-7 (Be-7),一种宇宙同位素,在城市路边沉积物中比在自然土壤中度更高. 这很可能是由于降雨事件的地表排水导致这些地区动员和沉积Be-7.
科学领域:
- 环境科学 环境科学
- 放射化学 放射化学是指辐射化学.
- 地质化学 地质化学
背景情况:
- 柏-7 (Be-7) 是一种由大气中的宇宙射线分离产生的宇宙性放射性同位素.
- 它在城市土壤和沉积物中的分布还不太清楚,这限制了它在环境研究中的使用.
- 了解Be-7的分布对于环境监测和追踪污染物运输至关重要.
研究的目的:
- 在城市土壤和沉积物中量化利-7 (Be-7) 度.
- 调查不同城市场景对Be-7分布的影响.
- 确定导致城市环境中Be-7积累的因素.
主要方法:
- 从三个不同的城市场景收集了土壤和沉积物的样本:自然斜坡,雨水排水沟,以及沿着青路边的路边沉积物.
- 使用酸 (NaI(Tl)) 检测器激活的酸 (NaI(Tl)) 探测器的马光谱法用于Be-7活动测量.
- 分析不需要化学分离,简化了测量过程.
主要成果:
- 来自自然坡道和排水沟的土壤样本中的Be-7活动范围从检测极限以下 (5 Bq/kg) 到39±5 Bq/kg.
- 来自铺设区域 (路边路边) 的沉积物样本显示出明显更高的Be-7活动,达到873±5 Bq/kg.
- 在自然土壤环境和积累的城市沉积物之间观察到Be-7度的明显对比.
结论:
- 与自然土壤环境相比,城市路边沉积物积累的柏-7 (Be-7) 度要高得多.
- 降雨期间的地表排水是动员和在路边沉积物中沉积Be-7的可能机制.
- 这项研究强调了考虑城市排水动态的重要性,以了解像Be-7这样的宇宙同位素的分布.
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