Investigation of the neutron contamination in IMRT deliveries with a paired magnesium and boron coated magnesium ionization chamber system.

Background And Purpose: Photon beams used in IMRT treatments with high energies (>10 MV) are contaminated with neutrons. Measurement of this neutron dose is of significance to the overall risk estimate of high energy radiotherapy.

Materials And Methods: For measuring neutron doses a paired magnesium and boron coated magnesium chamber system was used.