منابع مشابه
Accelerator boundary doses and skyshine.
Beginning this year, AEC contractors are being required to submit dose evaluations as low as 1.7 mrem per year to the surrounding public from their installations. This small incremental dose exists within the framework of a natural background of about 130 mrem per year. Some of the pitfalls in estimating these small doses, especially with regard to skyshine, are discussed. It is shown that, for...
متن کاملMeasuring the Skyshine from Linear accelerator in Rajaee Oncology Hospital
Introduction: Radiation therapy is using the ionizing radiation to eliminate or minimize cancerous tissues. This method has been very much considered in recent years. Because of the high energy of the photons produced by the accelerator, it is necessary to protect the walls, roof and the floor of the treatment rooms using the concrete and leaden materials. One of these harmful ...
متن کاملSkyshine photon doses from 6 and 10 MV medical linear accelerators
The skyshine radiation phenomenon consists of the scattering of primary photon beams in the atmosphere above the roof of a medical linear accelerator facility, generating an additional dose at ground level in the vicinity of the treatment room. Thus, with respect to radioprotection, this situation plays an important role when the roof is designed with little shielding and there are buildings ne...
متن کاملNeutron skyshine measurements at Fermilab.
Neutron skyshine has been a significant source of environmental radiation exposure at many high-energy proton accelerators. A particularly troublesome source of skyshine neutrons has existed at Fermilab during operation of the 400-GeV high-energy physics program. This paper reports on several measurements of this source made with a DePangher precision long counter at large distances. The spatia...
متن کاملProviding solid angle formalism for skyshine calculations
We detail, derive and correct the technical use of the solid angle variable identified in formal guidance that relates skyshine calculations to dose-equivalent rate. We further recommend it for use with all National Council on Radiation Protection and Measurements (NCRP), Institute of Physics and Engineering in Medicine (IPEM) and similar reports documented. In general, for beams of identical w...
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ژورنال
عنوان ژورنال: Health Physics
سال: 1974
ISSN: 0017-9078
DOI: 10.1097/00004032-197409000-00002