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By National Council on Radiation Protection, Ncrp
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Additional resources for Structural Shielding Design and Evaluation for Megavoltage X- and Gamma-Ray Radiotherapy Facilities
Example text
For single-mode machines, the 6 MV accelerating voltage is commonly used, while dual x-ray mode machines often have a 6 MV lowenergy beam and a 10 to 20 MV high-energy beam. Clinical electron beams may be an option on both single and dual x-ray mode machines. More recent clinical treatment procedures that may affect shielding requirements include SRS, TBI, and IMRT. , 1993) and robotic arms (Rodgers, 2005). 1 CONVENTIONAL PROCEDURES / 53 Total-body irradiation (TBI) procedures often require that the patient be located away from the isocenter by as much as 5 m, and therefore result in a large increase in the exposure to the barrier behind the patient as well as increased leakage-radiation production.
2 < dzz / ( maze width × height ) < 6; and 1 < (maze height/maze width) < 2]. 40 / 2. CALCULATIONAL METHODS The transmission factor required for the door shielding is calculated by dividing the shielding design goal (P) needed for the area outside the door by HTot. 2 MeV photons (Al-Affan, 2000; McGinley and James, 1997). If the inner maze wall is very thin, then the spectrum and intensity of the radiation at the door will increase due to the increased leakage radiation transmitted through this wall.
Making the door wider adds significantly to the weight and mechanical drive concerns as well as to the opening time and expense so it is a less desirable alternative. From the shielding viewpoint, these solutions are equally good and the choice may be made on architectural or other grounds. Since it is only possible to shield the gap (shielded door stop) between the door and the wall on the jamb side of the door, it is important to arrange the door so that the direct leakage radiation from the accelerator strikes the stop side rather than the side with the operator attached.