Part VI: Applications of Nuclear Physics

"There is no likelihood man can ever tap the power of the atom." — Robert Millikan (1928)

Millikan was spectacularly wrong, and the reason he was wrong is that he underestimated the consequences of nuclear physics. Today, nuclear physics generates roughly 10% of the world's electricity, enables the medical imaging and radiation therapy that saves millions of lives annually, underpins the international nonproliferation regime that has (so far) prevented nuclear catastrophe, and provides the tools — accelerators, detectors, radioactive sources — that drive discoveries across science.

In these five chapters, we examine the applications of nuclear physics in the modern world. Each chapter connects the fundamental physics developed in Parts I–IV to real-world technology, policy, and practice.

Chapter 26 covers nuclear energy: how reactors work, the fuel cycle from mining to waste disposal, the lessons of Three Mile Island, Chernobyl, and Fukushima, and the advanced reactor concepts (Gen IV, SMRs) that may define the future of nuclear power. Chapter 27 turns to nuclear medicine: PET imaging, proton and heavy-ion therapy, targeted radionuclide therapy, and the emerging field of theranostics. Chapter 28 addresses nuclear security: the physics of nuclear weapons, why proliferation is hard (and why it's not impossible), safeguards and verification, and nuclear forensics. Chapter 29 surveys radiation in the environment: natural background radiation, the biological effects of radiation, and the principles of radiation protection. Chapter 30 describes the accelerators and experimental techniques — the tools of nuclear science — that make all of this possible.

Throughout Part VI, the physics is primary. We do not merely describe what nuclear technology does; we explain why it works, grounded in the nuclear physics you have learned.

Chapters in Part VI: - Chapter 26: Nuclear Energy — reactors, fuel cycles, and the future of fission - Chapter 27: Nuclear Medicine — diagnosis, therapy, and theranostics - Chapter 28: Nuclear Security, Nonproliferation, and Forensics - Chapter 29: Radiation in the Environment — natural background, accidents, and protection - Chapter 30: Accelerators and Experimental Techniques — the tools of nuclear science

Chapters in This Part