SCATTERED RADIATION FROM BEDSIDE ROENTGEN EXAMINATIONS

Data for scattered radiation for 3 film sizes and 4 kilovoltages are shown. These data should make it possible to arrive at a reasonable assessment of the scattered radiation exposure to patients in adjacent beds when bedside roentgenography is performed. It is necessary to have available information as to the useful beam exposure rate for a given situation. In the absence of such information, the data given in Table 6 of Appendix B, NCRP Report No. 33 can be used.⁸

Information as to leakage radiation of tube housings under the conditions of use could be employed to advantage, but in their absence the worst condition can be assumed. For the conditions under which our experiment was conducted, the data translated into the scattered radiation per milliampere-second of exposure are shown in Table III.

A typical exposure for a roentgenogram of a pelvis using a 14x17 inch film and a 5:1 grid at 80 kvp. and 40 mas. would result in an exposure due to scattered radiation of approximately 0.21 milliroentgens at 6 feet from the center of the field. Even if the maximum permissible leakage is assumed, the sum of scattered and leakage radiation at this point would be only 0.24 mr.

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?