GAMMA-RAY SHIELDING STUDIES
GULF GENERAL ATOMIC CO SAN DIEGO CA SAN DIEGO
Pagination or Media Count:
A monoenergetic beam of gamma rays was used to study the deep penetration of 10-MeV gamma radiation in aluminum. Recently a positron annihilation system was developed at General Atomic for the purpose of making shielding measurements in the energy range from 5 to 30 MeV. A beam of positrons from the General Atomic linear accelerator is directed at a thin foil of beryllium. Some of the positrons annihilate in flight while passing through the foil, yielding photons along the beam axis having energies equal to the positron plus approx. 0.75 MeV. The bremsstrahlung produced by the positrons passing through the foil is assessed by passing a known number of electrons through the same foil and making an appropriate subtraction from the positron induced photons.
- Nuclear Radiation Shielding, Protection and Safety