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This is a supplement to Report NYO-4699 performed under the continuing Accelerator Survey Program. Stray radiation measurements made at 23 particle accelerator sites are summarized and discussed. Conclusions with regard to safe accelerator operation are drawn, as well as general conclusions regarding radiation dosimetry, maximum permissible levels, and instrumentation.
The stray radiation field from high energy particle accelerators is comprised of several components, e.g., fast and thermal neutrons, x- and gamma rays, proton recoils, and at sufficiently high energies, heavy particle recoils and mesons. In order to determine permissible occupancy times for personnel in this radiation field, a measurement is required both of the intensity and the energy of the different components constituting the spectrum. Then, from biological or clinical experience concerning the relative effectiveness of different radiations in producing deleterious effects, the biological hazard may be inferred. This outlines very briefly the radiation problem with an accelerator in operation.