MEDICINE
RADIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
the x-ray unit will not turn on
|
|
|
the electrical system of the dental radiography unit will sound an alarm
|
|
|
leakage of radiation
|
|
|
the x-ray unit will not emit radiation/energy to successfully expose a film
|
Detailed explanation-1: -The leakage radiation from the diagnostic source assembly measured at a distance of 1 meter in any direction from the source shall not exceed 0.88 milligray (mGy) air kerma (vice 100 milliroentgen (mR) exposure) in 1 hour when the x-ray tube is operated at the leakage technique factors.
Detailed explanation-2: -Surround the X-ray tube with at least 6 big X-ray cassettes with films, forming a closed volume (cubicle) around the X-ray tube housing (number the films). Perform a heavy exposure (according to the X-ray unit possibilities)-for example 120 kV/200 mA/1 sec. Develop the films and identify the dark places on the films.
Detailed explanation-3: -Flaws in head/applicator shielding, lack of head/applicator shielding, or an incorrectly positioned X-ray tube insert can lead to increased leakage radiation and consequently increased out-of-field patient dose.
Detailed explanation-4: -X-rays are created inside the X-ray head. Electrical current passes between the anode and the cathode and hit the target area where X-rays are produced. The X-rays then travel through the PID (positioning indicator device) where the X-ray beam exposes the receptor.