DOE Openness: Human Radiation Experiments: Roadmap to the
Project 3 the positively charged mass within an atom, composed
of neutrons and protons and possessing most of the mass but
occupying only a small fraction of the volume of the atom.
Physicists sought to release enormous quantities of energy by
splitting the nucleus of a hydrogen atom, generating a chain
reaction. 5For more than a half-century, Herbert M. Parker was a
leading force in radiological physics. He was codeveloper of a
systematic dosimetry scheme for implant therapy and the
innovative proposer of radiological units with unambiguous
physical and biological bases. He made seminal contributions to
the development of scientifically based radiation protection
standards and helped the Hanford Laboratories achieve prominence
in radiation biology, radioactive waste disposal, and
characterization of environmental radioactivity. For his inside
view of the maturation of medical physics and the birth and
evolution of the parallel field of health physics,