RAD MIDTERM 1 TCDHA (CHAPTERS 1-8, 17 & 19 (WEEKS 1-7) NEWEST 2024 ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A

RAD MIDTERM 1 TCDHA (CHAPTERS 1-8, 17 &

19 (WEEKS 1-7) NEWEST 2024 ACTUAL EXAM

100 QUESTIONS AND CORRECT DETAILED

ANSWERS WITH RATIONALES (VERIFIED

ANSWERS) |ALREADY GRADED A

What controls the quantity of x-rays produced? - ANSWERMilliamperage (mA)

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 _________ from the source of

radiation. - ANSWER- Inversely; square of the distance

Aluminium filters are used to remove ________ -energy,

_________ 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.

What is associated with long-term radiation effects? -

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 _______% - ANSWER- 60%

What should you do prior to taking x-rays to protect your patient

from radiation exposure?

a. Proper film processing

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 __________ 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 _______ -degree angle

to the beam. - ANSWER- 90; 135