Radiation Protection in the Design of Radiotherapy Facilities
International Atomic Energy Agency, 2006 - Business & Economics - 129 pages
This Safety Report provides practical guidance regarding the design and shielding of radiotherapy facilities. Methods for determining the necessary structural shielding for external beam units (60Co units, linear accelerators, superficial and orthovoltage units, and simulators), as well as brachytherapy units, are described. Data used for determining the structural shielding necessary for all types of radiotherapy facilities are reproduced and example calculations are provided for each type of facility. In addition, specific design features that could be incorporated into radiotherapy facilities, including those related to the security of radioactive sources, are discussed. This report is intended to be used primarily by radiological physicists in the planning and design of new radiotherapy facilities and in the remodelling of existing facilities. Sections of the report will also be of interest to architects, civil engineers, hospital administrators and others who are concerned with the design of radiotherapy facilities. In addition, the guidance in the report will be useful to regulatory personnel responsible for the licensing and inspection of these facilities.
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MATERIALS FOR SHIELDING
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additional shielding Atomic Energy Agency average barrier thickness required brachytherapy capture gamma dose design dose limit design limit determined from Eq distance dose output rate dose rate duct Email equation gamma ray gantry rotation axis Gy week"1 head leakage IAEA IMRT inner maze point International Atomic Energy Ionizing Radiation isocentre lead leakage radiation linear accelerator maze door maze entrance maze wall measurements mSv/week mSvweek"1 NCRP neutron dose equivalent number of TVLs occupancy factor patient scatter photon primary barrier primary beam primary radiation public area radiation beam RADIATION PROTECTION radiation scattered radiation source radiotherapy facilities reflection coefficient required attenuation required barrier thickness Safety Standards scatter and leakage scatter angle scatter fraction scattered radiation secondary barrier Section 6.3 shielding required structural shielding Table TADR teletherapy treatment control area treatment room treatment unit United Kingdom weekly workload X ray