Neutron Contamination from Medical Electron Accelerators (N by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Extra info for Neutron Contamination from Medical Electron Accelerators (N C R P Report)

Example text

For neutrons, however, the attenuation is quite low and even a gap in the shielding will not significantly increase the fluence in that direction. This is fortunate, perhaps, since it is difficult to measure beams of about 1cm2 area with neutron detectors, which typically have large dimensions. 42 / 2. I 0 I0 20 SHIELD THICKNESS 30 (cm) Fig. 28. The average energy of various neutron spectra as a function of the thickness of a spherical shell shield of tungsten surrounding the source (McCall et d.

When the best cross sections am desired, the latest compilation (BNL,1979) should be used. 2 TRANSPORT OF NJWI'RONS 0 2 4 6 IN ACCELERATOR HEAD 8 10 12 / 35 14 NEUTRON ENERGY (MeV) Fig. 21. Neutron interaction cross sections in natural tungsten as a function of neutron energy. These are adapted and simplified from Howerton, 1958. 0 0 2 4 6 8 10 12 14 NEUTRON ENERGY (MeV) Fig. 22. Neutron interaction cross sections in natural lead as a function of neutron energy. These are adapted and simplified from Howerton.

This topic has been adequately covered previously (NCRP, 1976: 1977). Assuming that scattered x rays have been adequately absorbed, the radiation field at the door will be a mixture of fast (but low-energy) neutrons, thermal neutrons, and neutron-capture gamma rays. The neutron-capture gamma rays are emitted from captures in the maze walls and the door itself. As stated above, in a room with a poorly designed maze, the neutron-capture gamma ray component may be l/5 or more of the total dose equivalent.

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