Rad Lab Test1 Questions and Answers
Describe the effect of any amount of radiation exposure on biologic tissues - Answer-Radiation has the
capacity to cause damage (change tissue, damage cells) to all types of living tissues.
Know the basic role of Roentgen, Kells, and Walkoff in the history of radiography. - Answer--Wilhelm
Conrad Roentgen: discovered the x-ray
-Walkoff: made first dental radiograph
-Kells: first practical use of radiographs in dentistry 1896
Know the properties (characteristics) of x-rays. - Answer--Tubehead: part that lines up the image
receptor holder and is directed at the patient's face
-Extension arm: connects tubehead to the control panel; allows horizontal and vertical changes in the
tubehead
-Control panel: allows operator to turn machine on or off and has adjustments for time, quality and
quantity of x-rays
-PID (cone): used to aim x-ray beam
Invisible, no mass/weight, no charge, travel at speed of light, short wavelength & high frequency waves,
cause ionization
Know the category (group) of radiation in which x-rays belong. - Answer-Electromagnetic radiation
, Define Bremsstrahlung (Braking) Radiation - Answer-(primary type of radiation produced in the x-ray
tubehead). It is the energy lost by deceleration of an electron is emitted in the form of a photon of
radiation, this is an x-ray.
What is the negatively charged terminal...the anode or cathode? - Answer-cathode
What two structures are made of tungsten? - Answer-Filament in cathode, anode
What is the source of electrons? - Answer-cathode
What is the source of x-rays? - Answer-Anode, tungsten target
Know how many impulses of x-rays are generated per 1 second and per 0.5 seconds. - Answer-1 second
= 60 impulses
0.5 seconds = 30 impulses
What is thermionic emission? - Answer-Release of electrons from tungsten filament when it is heated;
electrons stay in a cloud around the filament
What happens when the high voltage circuit is activated? - Answer-Electrons in cloud are accelerated
across x-ray tube to anode
When are x-rays produced? - Answer-When electrons travel from cathode to anode and into the
tungsten target
How much heat (%) and x-rays (%) is produced? - Answer-Heat: 99% X-ray: 1%
Describe the effect of any amount of radiation exposure on biologic tissues - Answer-Radiation has the
capacity to cause damage (change tissue, damage cells) to all types of living tissues.
Know the basic role of Roentgen, Kells, and Walkoff in the history of radiography. - Answer--Wilhelm
Conrad Roentgen: discovered the x-ray
-Walkoff: made first dental radiograph
-Kells: first practical use of radiographs in dentistry 1896
Know the properties (characteristics) of x-rays. - Answer--Tubehead: part that lines up the image
receptor holder and is directed at the patient's face
-Extension arm: connects tubehead to the control panel; allows horizontal and vertical changes in the
tubehead
-Control panel: allows operator to turn machine on or off and has adjustments for time, quality and
quantity of x-rays
-PID (cone): used to aim x-ray beam
Invisible, no mass/weight, no charge, travel at speed of light, short wavelength & high frequency waves,
cause ionization
Know the category (group) of radiation in which x-rays belong. - Answer-Electromagnetic radiation
, Define Bremsstrahlung (Braking) Radiation - Answer-(primary type of radiation produced in the x-ray
tubehead). It is the energy lost by deceleration of an electron is emitted in the form of a photon of
radiation, this is an x-ray.
What is the negatively charged terminal...the anode or cathode? - Answer-cathode
What two structures are made of tungsten? - Answer-Filament in cathode, anode
What is the source of electrons? - Answer-cathode
What is the source of x-rays? - Answer-Anode, tungsten target
Know how many impulses of x-rays are generated per 1 second and per 0.5 seconds. - Answer-1 second
= 60 impulses
0.5 seconds = 30 impulses
What is thermionic emission? - Answer-Release of electrons from tungsten filament when it is heated;
electrons stay in a cloud around the filament
What happens when the high voltage circuit is activated? - Answer-Electrons in cloud are accelerated
across x-ray tube to anode
When are x-rays produced? - Answer-When electrons travel from cathode to anode and into the
tungsten target
How much heat (%) and x-rays (%) is produced? - Answer-Heat: 99% X-ray: 1%
