Radiological Training for Accelerator Facilities
In 1929, Van de Graaff built a pilot machine
capable of generating 80,000 volts (80 keV).
In 1931, a 1.5 million-volt (MeV) machine was
built at Princeton.
State of the Art
A 25 MeV machine was built and operated at
Daresbury Laboratory in the United Kingdom.
In 1932 in England, John D. Cockcroft and Ernest T.S.
Walton constructed what is called a linear accelerator
using a high-voltage source to accelerate protons
through 700,000 volts (700 keV).
Straight-line accelerators suffer
from the disadvantage that the
From the first simple machines (Cockcroft-Walton and
finite length of flight path limits
Van de Graaff machines) evolved the larger and more
the particle energies that can be
elaborate machines. The modern example of this type
of accelerator is the linear accelerator, a sophisticated
machine used in many scientific and medical
Lawrence and the Development of the Cyclotron
The great breakthrough in accelerator technology came
in 1930 with Ernest O. Lawrence's invention of the