Medical X-Ray, Electron Beam, and Gamma-Ray Protection for by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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By National Council on Radiation Protection and Measurements

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Read Online or Download Medical X-Ray, Electron Beam, and Gamma-Ray Protection for Energies Up to 50 Mev: Equipment, Design, Performance, and Use PDF

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Extra info for Medical X-Ray, Electron Beam, and Gamma-Ray Protection for Energies Up to 50 Mev: Equipment, Design, Performance, and Use

Example text

1) Radiation source systems and imaging systems, as well as film and xerographic processors should be subjected to appropriate quality assurance programs with documentation, in order to minimize the unproductive application of radiation. ] (m) Measurements of mobile fluoroscopic table top and/or patient entrance kerma rate shad be made and documented at least annually. 5 MOBILE EQUIPMENT I 29 Comment: Fluoroscopic kerma rate measurements are especially necessary on apparatus employing imaging devices in which brightness is automatically controlled.

I t shall indicate either by an audible or visual signal, or both, obvious to the user, the passage of a predetermined period of irradiation not to exceed five minutes. The signal should last at least 15 seconds a t which time the timer must be reset manually. Comment: While the elapsed timer does not ensure safe operation it is of value as a training device for physicians learning the techniques of fluoroscopy, and for all users as a means for monitoring the passage of exposure time. (1) Indication of the kVp and mA in use should be visible to the fluoroscopist a t all times.

The difference between the length of each x-ray beam edge and each light-field edge shall not be greater than two percent of the source to image receptor distance at the image receptor. (g)Means shaU be provided to align the center of the x-raybeam, the fulcrum and the center of the image receptor. (h)A device s M be provided that automatically terminates the body section radiographic'exposure at a preset time interval, angle or kerma at the mceptor. The operator shall be able to terminate the exposure at any time.

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