一、前言 环境中β的测定是环境放射性污染监测的重要项目之一。随着我国的核电站和其他核设施的陆续兴建和运转,对周围环境的放射性监测必然会越来越显得重要。 ~(210)Pb是七十年代才迅速发展起来的测定年代学的手段,它可以用来测定每年几mm到 I. Introduction The determination of β in the environment is one of the important projects for environmental radioactive contamination monitoring. With the successive construction and operation of nuclear power plants and other nuclear facilities in our country, radioactive monitoring of the surrounding environment will inevitably become more and more important. ~ (210) Pb is a measure of chronology developed rapidly in the seventies. It can be used to measure several mm per year