Some parts of the book

Radioactivity, Nuclear Energy
In this chapter, we first discuss radioactive detectors and counters and the properties of a- and B-particles and y-rays emitted by disintegration of the nucleus. We follow with half-life and its application in radioactive atoms. The discovery of the nucleus, proton and nucleon number, isotopes and the mass spectrometer are then discussed. The final part of the chapter describes nuclear energy and the Einstein mass-energy application, and the principles of nuclear fission and fusion and the nuclear reactor. The chapter ends with a brief account of elementary particles and a unified theory.