Rad test 2

Photons are

• bundles of energy with mass and weight.

• bundles of energy that travel at the speed of sound.

• a component of the particle concept of electromagnetic radiation.

• a component of the wave concept of electromagnetic radiation.

Electromagnetic radiation

• is entirely human-made.

• includes x-rays and visible light.

• is a form of particulate radiation.

• has mass.

Within the x-ray tube, electrons are generated by the

• tungsten filament in the cathode.

• tungsten filament in the anode.

• molybdenum cup.

• copper stem.

Which form of the x-ray beam is most detrimental to the patient and operator?

• Primary radiation

• Secondary radiation

• Scatter radiation

• Useful beam

(1) All ionizing radiations cause damage to living tissues. (2) Although very little radiation is used in dentistry, damage to the cells does occur.

• Both statements are true.

• Both statements are false.

• The first statement is true; the second statement is false.

• The first statement is false; the second statement is true.

___________ refers to the total amount of radiation that is received or absorbed.

• Total dose

• Dose rate

• Amount of tissue irradiated

• Cell sensitivity

The traditional unit of dose is called

• the roentgen (R).

• the radiation absorbed dose (rad).

• the roentgen equivalent in man (rem).

• the gray (Gy).

Which of the following is associated with long-term radiation effects?

• Symptoms include diarrhea, hair loss, and hemorrhage.

• Small amounts of radiation absorbed over a long period

• Acute radiation syndrome

• The injury period in the sequence of radiation injury is seen within minutes, days, or weeks of radiation exposure.

Which of the following cells would be the most sensitive to x-rays?

• Nerve

• Bone

• Muscle

• Blood

Which of the following combinations will result in the lowest absorbed dose for the patient from a 20-film series of dental radiographs?

• Round collimation with digital sensor

• Rectangular collimation with digital sensor

• Round collimation with F-speed film

• Rectangular collimation with F-speed film