The object of this book is to provide an introduction to quantitative radiobiology and, particularly, to those aspects of the subject that have a practical application. Radiation is used to cure cancer, but can also cause it. Radiation is also used in medical diagnosis and in nuclear power stations. In all these fileds, where questions of benefit and detriment arise, the biological effects of the radiation can now be predicted. There are not many walks of life where risk estimates are so firmly founded on quantitative data. This is not only because of the precision with which radiation dose...