| build-up | <radiobiology> The increase in absorbed dose with depth below the surface in a material irradiated by a beam of X-rays or gamma rays. Build-up may be two kinds: 1. Electron Build-up: This is due to an increasing electron fluence in the material. 2. Photon Build-up: This is due to scattering in broad beams of radiation. For high energy beams, process 1. Is the more important. (16 Dec 1997) |
|---|