Unwanted radiation produced by leakage neutrons from medical electron accelerators

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Abstract
Monte Carlo calculations were made to determine the energy delivered to a phantom by neutrons escaping from the head of a Varian Clinac 35 medical accelerator at an SSD [skin-source distance] of 1 m. The energy was sorted into 2 regions: inside and outside a volume defined by a circular beam of area 100 and 600 cm2. For the 2 beam sizes, the energies outside the treatment volume were 12 and 8.7 g-rad (per photon rad), respectively. Room scattering increased these values by about 20%. These energies are smaller than those delivered by scattered photons by more than 10 times.

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