Module 1B Assignment Flashcards
Exit or image formation radiation is composed of which of the following?
a.) primary photons and wide angle compton scattered photons
b.) non interaction and small angle scattered photons
c.) very low engrid photons
d.) auger electron
b.) non interaction and small angle scatted photons
Which of the following contributes significantly to the exposure of the radiographer?
a.) positrons
b.) electrons
c.) compton scatted photons
d.) compton scattered electrons
c.) compton scattered photons
Which of the following defines attenuation?
a.) absorption and scatter
b.) absorption only
c.) scatter only
d.) weakend only
a.) absorption and scatter
In the radiologic kilo voltage range, which of the following structures undergoes the most photoelectric absorption?
a.) air cavities
b.) compact bone
c.) fat
d.) soft tissue
b.) compact bone
In which of the following xray interactions with matter is the energy in the incident photon partially absorbed?
a.) compton
b.) photoelectric
c.) coherent
d.) pair production
a.) compton
When a high atomic number solution is either swallowed or injected into human tissue or a structure to visualize it during an imaging procedure, which of the following occurs?
a.) photoelectric interaction becomes greatly decreased, resulting in the absorbed dose in the body tissues or structures that contain the contrast medium
b.) photoelectric itneraction becomes significantly enhanced, leading to an increase in the absorbed dose in the body tissues or structures that contain the contrast medium
c.) photoelectric interacction becomes greatly decreased, resulting in a decrease in the absorbed dose in the body tissues or structures that contain the contrast medium
d.) photoelectric interaction becomes significantly enhanced, leading to a decrease in the absorbed dose in the body tissue or structures that ocntain the contrast medium
b.) photoelectric interaction becomes significantly enhanced, leading to an increase in the absorbed dose in the body tissues or structures that contain the contrast medium
Equivelent dose:
a.) attemprts to take in to account the various differences in biologic harm caused by different types of radiaiton
b.) takes into account the dose for all types of radiation to organs or tissues in the human body
c.) assigns a tissue weighting factor, which takes into account the relative detriment to each organ and tissue
d.) assigns a quality factor to determine the ability of a dose of any kind of ionizing radiaiton to cause biologic damge
a.) attempts to take in to account the various differencees in biologic harm caused by different types of radiation
Which of the following influences attenuation?
1.) effective atomic number of the absorber
2.) mass density
3.) thickness of the absorber
a.) 1 only
b.) 2 only
c.) 3 only
d.) 1, 2 and 3
d.) 1, 2 and 3
A decrease in contrast of the image by adding an unwanted additional exposure (radiographic fog) results from which of the following interactions between x radiation matter?
1.) compton scattering
2.) pair production
3.) photoelectric absorption
a.) 1 only
b.) 2 only
c.) 3 only
d.) 1, 2 and 3
a.) 1 only
Alpha particles have a quality factor and radiation weighting factor that is numerically equal to:
a.) 1
b.) 5
c.) 10
d.) 20
d.) 20
Which of the following was used as the first measure of exposure for ionizing radiation?
a.) air kerma
b.) skin erythema
c.) sievert
d.) roentgen
b.) skin erythema
Which of the following is the unit of collective effective dose?
a.) coloumbs per kilogram sievert
b.) gray sievert
c.) person sievert
d.) rad sievert
c.) person sievert
The concept of tissue weighting factor is used to do which of the following?
a.) account for the risk to the entire organism brought on by irradation of individual tissues and organs
b.) eliminate the need for determining affective dose
c.) measure absorbed dose from all different types of ionizing radiations
d.) modify the radiation weighting factor for different types of ionizing radiation
a.) account for the risk to the entire organism brought on by irradiation of individual tissues and organs
To convert the number of gray into milligray, the number of gray must be:
a.) divided by 100
b.) divided by 1000
c.) multiplied by 100
d.) multiplied by 1000
d.) multiplied by 1000
What is the SI radiation unit coloumbs per kilogram used to specify?
a.) equivalent dose
b.) absorbed dose in biologic tissue
c.) radiation exposure in air only
d.) speed at which xray photons travel
c.) radiation exposure in air only