Analysis of Personnel Exposures in Neutron Therapy Facilities

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Abstract
In conventional radiation-therapy facilities, radiation doses to medical personnel originate from the leakage radiation of 60Co teletherapy systems or from photoneutrons produced during the operation of X-ray generators at energies > 10 MeV in unsuitably shielded therapy rooms. In neutron-therapy facilities, during patient set-ups and position verifications, medical personnel are exposed to photons from remanent radioactivity induced in the shielding around the neutron-producing targets and in the beam collimators. At Fermilab [Illinois, USA ], the use of an elevating platform limited personnel exposure periods to those times when collimators were exchanged. Comparisons with other facilities were shown.