Cosmogenic ^7Be : Atmospheric Concentration and Deposition in Japan

概要

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Interactions between cosmic rays and atmospheric components produce various nuclear fragments. Cosmogenic ^7Be distributes uniformly in the atmosphere which covers all over the earth. Thus, the vertical and horizontal transport of ^7Be in the stratosphere as well as troposphere will work as an effective tracer with half life of 53.3 days. Many studies have been conducted on ^7Be atmospheric concentration and deposition onto the ground. Generally, the atmospheric ^7Be concentration and the ^7Be deposition show seasonal and yearly variations which are controlled by solar activity, cosmic ray intensity, atmospheric circulation and other mechanisms such as "washout" and "rainout". This paper presents atmospheric ^7Be concentration and ^7Be deposition data obtained by the authors as well as other investigators. The variations of atmospheric ^7Be concentration and ^7Be deposition and their influential factors are also reviewed.
日本保健物理学会の論文