Chapter 38: Radiography, Radiographic Equipment, and Radiation Safety

the maximum permissible dose of radiation for occupationally exposed person is

5.0rems/year

during the production of x-rays, how much energy is lost as heat

99%

what states that all exposure to radiation should be kept to a minimum or as low as reasonable achievable

ALARA concept

who discovered x-rays

WC roentgen

which patients should wear a lead apron and thyroid collar

all patients

the name of the positive electrode inside the xray tube is the

anode

what is the primary type of radiation produced in the dental xray tubehead

bremsstrahlung radiation

who was the first person to make practical use of radiographs in dentistry

c edmund kells

the name of the negative electrode inside the xray rube is the

cathode

radiations that is passed on to future generations is the

genetic effect

___ is the process by which electrons are removed from electrically stable atoms

ionization

the name of the process for the harmful effects of xrays is

ionization

what exposure factor controls contrast

kVp

the period of time between xray exposure and the appearance of symptoms if the

latent period

what is located on the xray machine control panel

milliamperage selector (mA)

density is the

overall darkness of a processed radiograph

what are the types of radiation

primary, secondary, scatter

a structure that appears dark on a processed radiograph is

radiolucent

a structure that appears light on a processed radiograph

radiopaque

the purpose of the collimator is to

reduce the exposure of the primary beam and restrict the size of the primary beam

the purpose of the aluminum filter is to

remove the low energy, low wavelength rays

___ is a system that is used to measure radiation

the tradition or standard system and the systeme internationale

what is the purpose of equipment monitoring

to check for radiation leakage

what is the purpose of using a position indicator device (PID)

to direct the xray beam

whar is the purpose of personnel monitoring

to record the amount of radiation the operator recieves

the primary components of a dental xray machine are the __

tube head, PID, extension arm