In this lesson, students will investigate the nature of radioactivity and the effect of both distance and shielding materials on different radioactive sources using a Geiger-Muller tube with a counter ...

This is a preview. Log in through your library . Abstract A model with two stages and clonal expansion (TSCE) is reviewed as a prototype for biologically based models of cancer development.

IN determining the uranium content of a series of rocks for the purpose of studying its geochemical behaviour, difficulties are often encountered because of the loss of uranium by leaching. In some ...