Salisbury Russell T, Cartwright John
Department of Biological Sciences, University College Chester, Parkgate Road, Chester, CH1 4BJ, United Kingdom.
J Environ Radioact. 2005;78(3):353-61. doi: 10.1016/j.jenvrad.2004.05.013.
Beryllium-7 (7Be) is a cosmogenic radionuclide with a half-life of 53.3 days produced mostly in the stratosphere by cosmic ray spallation of nitrogen and oxygen and entering the lower troposphere by atmospheric circulation processes. Most of the nuclide is removed by rainout during precipitation, so given that rainfall generally increases with altitude, it was considered probable that 7Be deposition would also be greater at higher altitudes. The aim of this study was to determine if there is any relationship between 7Be concentrations, altitude and precipitation by measuring 7Be activity within sheep faeces. An area of North Wales and Northwest England was selected for study, extending from the Dee Estuary at sea level to Snowdon at 1065 m. The results obtained showed a significant increase in 7Be activity with increasing altitude and precipitation consistent with predictions based on the existing literature.
铍 - 7（⁷Be）是一种宇宙成因放射性核素，半衰期为53.3天，主要在平流层由氮和氧的宇宙射线散裂产生，并通过大气环流过程进入对流层下部。大部分这种核素在降水期间通过雨除作用被去除，所以鉴于降雨量一般随海拔升高而增加，人们认为⁷Be沉降在较高海拔处也可能更大。本研究的目的是通过测量绵羊粪便中的⁷Be活度，确定⁷Be浓度、海拔和降水之间是否存在任何关系。选择了北威尔士和英格兰西北部的一个区域进行研究，范围从海平面的迪河河口延伸至海拔1065米的斯诺登山。所获得的结果表明，随着海拔和降水增加，⁷Be活度显著增加，这与基于现有文献的预测一致。
