Term
| An area occupied by radiation workers is called a controlled area and require barriers reduce the exposure rate to less than ........? |
|
Definition
|
|
Term
| An area not occupied by radiation workers is called an uncontrolled area and the maximum exposure rate allowed shall not exceed ......? |
|
Definition
|
|
Term
| A protective barrier must be in place that limits exposure that is not directed to the image receptor to less than ......? |
|
Definition
|
|
Term
| The dose rate in any unrestricted area cannot exceed .......... and the total effective dose equivalent cannot exceed ............? |
|
Definition
| 2 mrem in 1 hour / 100 mrem annually |
|
|
Term
| A radiation area is considered a place where an individual could receive more than ..... but less than ...... in 1 hour at ...... from the source. |
|
Definition
| 5 rem / 100mrem in 1 hour at 30 cm |
|
|
Term
| A high radiation area is considered when an individual could receive more than .........? |
|
Definition
|
|
Term
| A very high radiation area is considered when an individual could receive an excess of an absorbed dose of ........? |
|
Definition
|
|
Term
| The floor area of the operator's booth shall not have less than .......... of a visual unobstructed floor space and free of any floor obstruction. |
|
Definition
|
|
Term
| Walls shall be permanently fixed at the floor and at least ...... high with a minimum of ........ equalivent. Four inches of concrete is equivalent to 1/16 inch of lead. |
|
Definition
| 7 feet / 1/16 pb equalivent |
|
|
Term
| Leakage radiation shall never exceed ........... at ...........? |
|
Definition
| 100 mR/hr at 1 meter(3feet) |
|
|
Term
Exposure linearity is determined by using a dosimeter using combinations of mA and exposure
times to produce the same mAs. The radiation intensity (mR/mAs) for adjacent mA stations
cannot exceed .........? |
|
Definition
|
|
Term
Exposure reducibility is determined by selecting kvp, mA, and exposure time and precisely the same radiation exposure should occur. This is done by making 10 repeated exposures in one
hour at the same technique and observing that the average variation in radiation intensity does
not vary by .........? |
|
Definition
|
|
Term
| Kilovolts peak must be within ...... kvp of the actual kvp selected. A variation of ... kvp is necessary to affect radiographic contrast, a variation of ..... kvp will measurable affect patient dose and optical density. |
|
Definition
|
|
Term
| The timer accuracy must be within .... of the indicated time |
|
Definition
|
|
Term
| The maximum exposure rate shall not exceed ........ R/min at the point where the center of the useful beam enters the patient. |
|
Definition
|
|
Term
| The field of exposure light must provide an illumination of at least .... lux (..... foot-candles) at ..... or the maximum SID. |
|
Definition
|
|
Term
| The maximum acceptable variation is ..... when observing linearity for mAs. |
|
Definition
|
|
Term
A protective lead apron shall be assigned to each portable x-ray unit and the exposure switch for .
such unit must allow the operator to remain at least ......... from the x-ray tube during
exposure. |
|
Definition
|
|
Term
| The control switch in a fixed radiographic unit shall be fixed within the booth at a position at least....... from any open edge of the booth wall closest to the examining table and shall allow the operator to use the viewing window. |
|
Definition
|
|
Term
| Viewing windows shall have a viewing area of at least 1 square foot and be positioned so that some portion of the window is at least 5 feet above the floor. The distance between the opening edge of the control booth and the edge of the window shall not be less than....... and the glass in the window shall have the same lead equivalency as the shielding required for the control booth wall. |
|
Definition
|
|
Term
| The source to skin distance shall be limited to not less that ......... on stationary fluoroscopes and not less than...... on mobile units. |
|
Definition
|
|
Term
| The image intensifier assembly in fluoroscopy serves as a primary protective barrier and must be....... or equivalent. |
|
Definition
|
|
Term
| The total filtration of the fluoroscope must be at least.......... equivalent |
|
Definition
|
|
Term
| During fluoroscopy, the bucky tray is moved to the end of the examination table leaving an opening in the side of the table approximately....... wide at the gonadal level. This opening should be automatically covered with at least........ Pb equivalent. |
|
Definition
|
|
Term
| The intensity of the x-ray beam at the tabletop of a fluoroscope should not exceed......... R/min, but under no conditions shall the intensity exceed....... R/min. |
|
Definition
|
|
Term
| Federal and most state laws require that under no circumstances shall the entrance skin dose rate exceed........ rad/min for systems operating under control of automatic brightness stabilization (ABS). Under manual control the entrance skin dose shall not exceed........rad/min. |
|
Definition
|
|
Term
| Protective apparel should be no less than......... mm lead equivalent but shall be no less than......... mm Pb equivalent and fluoroscoped annually to check for cracks. |
|
Definition
|
|
