By National Council on Radiation Protection and Measurements
This record of the nationwide Council on Radiation safeguard and Measurements, which supersedes NCRP file No. 34, is anxious with structural defensive layout and overview for clinical installations using x-rays and gamma rays of energies as much as 10 MeV. The document comprises options and technical info in addition to a dialogue of many of the elements which needs to be thought of within the choice of applicable protective fabrics and within the calculation of the barrier thickness. This file is especially meant for radiological physicists, radiologists, and regulatory team of workers who concentrate on radiation safety. Sections of the document can be of curiosity additionally to architects, health facility directors, and others who're considering the making plans of latest radiation amenities
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Extra resources for Structural shielding design and evaluation for medical use of X-rays and gamma rays of energies up to 10 MeV : recommendations of the National Council on Radiation Protection and Measurements
20 A primary protective barrier that does not extend over a n entire wall (floor or ceiling) should include an extended margin beyond the maximum projected beam size to guard against misalignment of the beam. , for which the usual secondary barriers may be inadequate. The width of the margin will depend upon the room dimensions, type and location of equipment, and the energy of the radiation. For a n orthovoltage therapy installation with a n average size treatment room, a 30 cm (12 inches) margin is usually adequate.
Protective source housing: A n enclosure, for a gamma-beam therapy source, so constructed t h a t the leakage radiation does not exceed specified limits with the source in the "OFF" and in the " O N conditions. (a) Beam "OFF' condition. om the source, the maximum and average exposure rates do not exceed 10 mR h-' and 2 mR h-', respectively, when the beam control mechanism is in the "OFF" position. (b) Beam " O N condition. 1 percent of the useful beam exposure rate a t that distance when the beam control mechanism is in the " O N position, except for the portion of the housing which includes the collimator zone.
2 Computation of Secondary Protective Barriers Secondary protective barriers shield against both leakage and scat7 tered radiation. As these two types of radiation are of different qualities, it is necessary to compute the barrier thickness requirements for each separately. 1 percent of the usefbl beam exposure rate, Xu, a t one meter from the source). Thus, the weekly leakage exposure, XL, a t the point of interest, which is a t a distance ds, from the source of radiation (see Figure B-1), would be where t is the number of minutes of beam ON-time in a week.