By Paul R. Cohen, Edward A. Feigenbaum
The instruction manual of man-made Intelligence
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1 Numerical illustration of data. - 2 Operations on binary facts. - three Combinational good judgment layout. - four Sequential good judgment basics. - five layout of sequential good judgment circuits. - 6 The electronic process. - 7 useful electronic circuits. - solutions to difficulties.
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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.