RAD MIDTERM 1 TCDHA (CHAPTERS 1-8, 17 &
19 (WEEKS 1-7)<\/p>\n\n\n\n
What controls the quantity of x-rays produced? – ANSWER\u0002Milliamperage (mA) What is associated with long-term radiation effects? – a. Proper film processing
In regard to increasing density: – ANSWER- An increase in
either kVp or mA will increase density.
According to inverse square law, the intensity of radiation is
proportional to the <\/strong>from the source of
radiation. – ANSWER- Inversely; square of the distance
Aluminium filters are used to remove -energy,
<\/strong><\/em> wavelength x-rays. – ANSWER- Low; Longer
What specific mechanism of radiation injury may result in the
formation of hydrogen peroxide when x-ray energy is absorbed
by patients? – ANSWER- Free radical formation created by the
ionization of water may occur.<\/p>\n\n\n\n
ANSWER- Small amounts of radiation absorbed over a long
period.
Which of the following is the LEAST sensitive to x-rays?
a. Bone marrow
b. Salivary glands
c. Lymphoid tissue
d. Intestine – ANSWER- b. Salivary Glands
TRUE OR FALSE:
Risk estimates suggest (1) that death is more likely to occur
from common activities than from dental imaging procedures
and (2) that caner is much more likely to be unrelated to dental
imaging radiation exposure. – ANSWER- Both statements are
TRUE!
The use of F-speed film instead of D-speed film reduces the
absorbed dose by _<\/em><\/strong>% – ANSWER- 60%
What should you do prior to taking x-rays to protect your patient
from radiation exposure?<\/p>\n\n\n\n
b. Proper prescribing of radiographs
c. A Lead Apron
d. A Thyroid Collar – ANSWER- b. Proper prescribing of
radiographs
What does the Inherent filtration in dental x-ray tube head
include? – ANSWER- It includes filtration that takes places
when the primary beam passes through the glass window of the
X-ray tube, the insulating oil, and the tube head seal.
What decreases patient exposure considerably? – ANSWER- A
rectangular collimator
Which type of position-indicating device (PID) produce scatter
radiation? – ANSWER- Square
On some dental x-ray machines, only the _<\/em><\/strong> can be
altered; the other parameters are preset by manufacturer. –
ANSWER- Exposure Time
In order to avoid the primary beam while taking dental images,
you should stand at s -degree to __<\/em><\/strong> -degree angle
to the beam. – ANSWER- 90; 135<\/p>\n\n\n\n